AM69A: SSH "Algorithm negotiation fail" error in CCS 12

Y. Bas

Part Number: AM69A
Other Parts Discussed in Thread: AM69

Tool/software:

Hi,

I have still same issue specified in locked thread . I would like to share some useful additional information. As a response to Tanmay Patil's question :

I'm trying GDB debugger method over ethernet.
For RSE, i'm trying to establish connection via same ethernet configuration.
List of services running on AM69A:

root@am69-sk:~# systemctl list-units --all
UNIT                                                                                                                                        LOAD      ACTIVE   SUB    >
dev-disk-by\x2did-mmc\x2dG1M15L_0x278654d5.device                                                                                           loaded    active   plugged>
dev-disk-by\x2did-mmc\x2dG1M15L_0x278654d5\x2dpart1.device                                                                                  loaded    active   plugged>
dev-disk-by\x2did-mmc\x2dG1M15L_0x278654d5\x2dpart2.device                                                                                  loaded    active   plugged>
dev-disk-by\x2did-mmc\x2dSC32G_0x5e42a88a.device                                                                                            loaded    active   plugged>
dev-disk-by\x2did-mmc\x2dSC32G_0x5e42a88a\x2dpart1.device                                                                                   loaded    active   plugged>
dev-disk-by\x2did-mmc\x2dSC32G_0x5e42a88a\x2dpart2.device                                                                                   loaded    active   plugged>
dev-disk-by\x2dlabel-boot.device                                                                                                            loaded    active   plugged>
dev-disk-by\x2dlabel-root.device                                                                                                            loaded    active   plugged>
dev-disk-by\x2dpartuuid-45246c4d\x2d01.device                                                                                               loaded    active   plugged>
dev-disk-by\x2dpartuuid-45246c4d\x2d02.device                                                                                               loaded    active   plugged>
dev-disk-by\x2dpartuuid-7f437a52\x2d01.device                                                                                               loaded    active   plugged>
dev-disk-by\x2dpartuuid-7f437a52\x2d02.device                                                                                               loaded    active   plugged>
dev-disk-by\x2dpath-platform\x2d4f80000.mmc.device                                                                                          loaded    active   plugged>
dev-disk-by\x2dpath-platform\x2d4f80000.mmc\x2dboot0.device                                                                                 loaded    active   plugged>
dev-disk-by\x2dpath-platform\x2d4f80000.mmc\x2dboot1.device                                                                                 loaded    active   plugged>
dev-disk-by\x2dpath-platform\x2d4f80000.mmc\x2dpart1.device                                                                                 loaded    active   plugged>
dev-disk-by\x2dpath-platform\x2d4f80000.mmc\x2dpart2.device                                                                                 loaded    active   plugged>
dev-disk-by\x2dpath-platform\x2d4fb0000.mmc.device                                                                                          loaded    active   plugged>
dev-disk-by\x2dpath-platform\x2d4fb0000.mmc\x2dpart1.device                                                                                 loaded    active   plugged>
dev-disk-by\x2dpath-platform\x2d4fb0000.mmc\x2dpart2.device                                                                                 loaded    active   plugged>
dev-disk-by\x2duuid-2E4E\x2dA0CB.device                                                                                                     loaded    active   plugged>
dev-disk-by\x2duuid-655561b2\x2d58c1\x2d4aaa\x2d8f48\x2d963b292dee96.device                                                                 loaded    active   plugged>
dev-disk-by\x2duuid-D1B2\x2d8B04.device                                                                                                     loaded    active   plugged>
dev-disk-by\x2duuid-f9b6582c\x2dc36a\x2d4a06\x2d9dda\x2dcc70b3725625.device                                                                 loaded    active   plugged>
dev-mmcblk0.device                                                                                                                          loaded    active   plugged>
dev-mmcblk0boot0.device                                                                                                                     loaded    active   plugged>
dev-mmcblk0boot1.device                                                                                                                     loaded    active   plugged>
dev-mmcblk0p1.device                                                                                                                        loaded    active   plugged>
dev-mmcblk0p2.device                                                                                                                        loaded    active   plugged>
dev-mmcblk1.device                                                                                                                          loaded    active   plugged>
dev-mmcblk1p1.device                                                                                                                        loaded    active   plugged>
dev-mmcblk1p2.device                                                                                                                        loaded    active   plugged>
dev-mtdblock0.device                                                                                                                        loaded    active   plugged>
dev-mtdblock1.device                                                                                                                        loaded    active   plugged>
dev-mtdblock2.device                                                                                                                        loaded    active   plugged>
dev-mtdblock3.device                                                                                                                        loaded    active   plugged>
dev-mtdblock4.device                                                                                                                        loaded    active   plugged>
dev-mtdblock5.device                                                                                                                        loaded    active   plugged>
dev-mtdblock6.device                                                                                                                        loaded    active   plugged>
dev-rfkill.device                                                                                                                           loaded    active   plugged>
dev-ttyp0.device                                                                                                                            loaded    active   plugged>
dev-ttyp1.device                                                                                                                            loaded    active   plugged>
dev-ttyp2.device                                                                                                                            loaded    active   plugged>
dev-ttyp3.device                                                                                                                            loaded    active   plugged>
dev-ttyp4.device                                                                                                                            loaded    active   plugged>
dev-ttyp5.device                                                                                                                            loaded    active   plugged>
dev-ttyp6.device                                                                                                                            loaded    active   plugged>
dev-ttyp7.device                                                                                                                            loaded    active   plugged>
dev-ttyp8.device                                                                                                                            loaded    active   plugged>
dev-ttyp9.device                                                                                                                            loaded    active   plugged>
dev-ttypa.device                                                                                                                            loaded    active   plugged>
dev-ttypb.device                                                                                                                            loaded    active   plugged>
dev-ttypc.device                                                                                                                            loaded    active   plugged>
dev-ttypd.device                                                                                                                            loaded    active   plugged>
dev-ttype.device                                                                                                                            loaded    active   plugged>
dev-ttypf.device                                                                                                                            loaded    active   plugged>
dev-ttyS0.device                                                                                                                            loaded    active   plugged>
dev-ttyS1.device                                                                                                                            loaded    active   plugged>
dev-ttyS10.device                                                                                                                           loaded    active   plugged>
dev-ttyS11.device                                                                                                                           loaded    active   plugged>
dev-ttyS2.device                                                                                                                            loaded    active   plugged>
dev-ttyS3.device                                                                                                                            loaded    active   plugged>
dev-ttyS4.device                                                                                                                            loaded    active   plugged>
dev-ttyS5.device                                                                                                                            loaded    active   plugged>
dev-ttyS6.device                                                                                                                            loaded    active   plugged>
dev-ttyS7.device                                                                                                                            loaded    active   plugged>
dev-ttyS8.device                                                                                                                            loaded    active   plugged>
dev-ttyS9.device                                                                                                                            loaded    active   plugged>
sys-devices-platform-bus\x40100000-2761000.can-net-can2.device                                                                              loaded    active   plugged>
sys-devices-platform-bus\x40100000-2771000.can-net-can3.device                                                                              loaded    active   plugged>
sys-devices-platform-bus\x40100000-2880000.serial-tty-ttyS2.device                                                                          loaded    active   plugged>
sys-devices-platform-bus\x40100000-4f80000.mmc-mmc_host-mmc0-mmc0:0001-block-mmcblk0-mmcblk0boot0.device                                    loaded    active   plugged>
sys-devices-platform-bus\x40100000-4f80000.mmc-mmc_host-mmc0-mmc0:0001-block-mmcblk0-mmcblk0boot1.device                                    loaded    active   plugged>
sys-devices-platform-bus\x40100000-4f80000.mmc-mmc_host-mmc0-mmc0:0001-block-mmcblk0-mmcblk0p1.device                                       loaded    active   plugged>
sys-devices-platform-bus\x40100000-4f80000.mmc-mmc_host-mmc0-mmc0:0001-block-mmcblk0-mmcblk0p2.device                                       loaded    active   plugged>
sys-devices-platform-bus\x40100000-4f80000.mmc-mmc_host-mmc0-mmc0:0001-block-mmcblk0.device                                                 loaded    active   plugged>
sys-devices-platform-bus\x40100000-4fb0000.mmc-mmc_host-mmc1-mmc1:aaaa-block-mmcblk1-mmcblk1p1.device                                       loaded    active   plugged>
sys-devices-platform-bus\x40100000-4fb0000.mmc-mmc_host-mmc1-mmc1:aaaa-block-mmcblk1-mmcblk1p2.device                                       loaded    active   plugged>
sys-devices-platform-bus\x40100000-4fb0000.mmc-mmc_host-mmc1-mmc1:aaaa-block-mmcblk1.device                                                 loaded    active   plugged>
sys-devices-platform-bus\x40100000-bus\x40100000:bus\x4028380000-40528000.can-net-can0.device                                               loaded    active   plugged>
sys-devices-platform-bus\x40100000-bus\x40100000:bus\x4028380000-40568000.can-net-can1.device                                               loaded    active   plugged>
sys-devices-platform-bus\x40100000-bus\x40100000:bus\x4028380000-46000000.ethernet-net-eth0.device                                          loaded    active   plugged>
sys-devices-platform-bus\x40100000-bus\x40100000:bus\x4028380000-47000000.bus-47040000.spi-spi_master-spi0-spi0.0-mtd-mtd0-mtdblock0.device loaded    active   plugged>
sys-devices-platform-bus\x40100000-bus\x40100000:bus\x4028380000-47000000.bus-47040000.spi-spi_master-spi0-spi0.0-mtd-mtd1-mtdblock1.device loaded    active   plugged>
sys-devices-platform-bus\x40100000-bus\x40100000:bus\x4028380000-47000000.bus-47040000.spi-spi_master-spi0-spi0.0-mtd-mtd2-mtdblock2.device loaded    active   plugged>
sys-devices-platform-bus\x40100000-bus\x40100000:bus\x4028380000-47000000.bus-47040000.spi-spi_master-spi0-spi0.0-mtd-mtd3-mtdblock3.device loaded    active   plugged>
sys-devices-platform-bus\x40100000-bus\x40100000:bus\x4028380000-47000000.bus-47040000.spi-spi_master-spi0-spi0.0-mtd-mtd4-mtdblock4.device loaded    active   plugged>
sys-devices-platform-bus\x40100000-bus\x40100000:bus\x4028380000-47000000.bus-47040000.spi-spi_master-spi0-spi0.0-mtd-mtd5-mtdblock5.device loaded    active   plugged>
sys-devices-platform-bus\x40100000-bus\x40100000:bus\x4028380000-47000000.bus-47040000.spi-spi_master-spi0-spi0.0-mtd-mtd6-mtdblock6.device loaded    active   plugged>
sys-devices-platform-serial8250-tty-ttyS0.device                                                                                            loaded    active   plugged>
sys-devices-platform-serial8250-tty-ttyS1.device                                                                                            loaded    active   plugged>
sys-devices-platform-serial8250-tty-ttyS10.device                                                                                           loaded    active   plugged>
sys-devices-platform-serial8250-tty-ttyS11.device                                                                                           loaded    active   plugged>
sys-devices-platform-serial8250-tty-ttyS3.device                                                                                            loaded    active   plugged>
sys-devices-platform-serial8250-tty-ttyS4.device                                                                                            loaded    active   plugged>
sys-devices-platform-serial8250-tty-ttyS5.device                                                                                            loaded    active   plugged>
sys-devices-platform-serial8250-tty-ttyS6.device                                                                                            loaded    active   plugged>
sys-devices-platform-serial8250-tty-ttyS7.device                                                                                            loaded    active   plugged>
sys-devices-platform-serial8250-tty-ttyS8.device                                                                                            loaded    active   plugged>
sys-devices-platform-serial8250-tty-ttyS9.device                                                                                            loaded    active   plugged>
sys-devices-virtual-misc-rfkill.device                                                                                                      loaded    active   plugged>
sys-devices-virtual-tty-ttyp0.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttyp1.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttyp2.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttyp3.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttyp4.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttyp5.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttyp6.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttyp7.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttyp8.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttyp9.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttypa.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttypb.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttypc.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttypd.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttype.device                                                                                                        loaded    active   plugged>
sys-devices-virtual-tty-ttypf.device                                                                                                        loaded    active   plugged>
sys-module-configfs.device                                                                                                                  loaded    active   plugged>
sys-module-fuse.device                                                                                                                      loaded    active   plugged>
sys-subsystem-net-devices-can0.device                                                                                                       loaded    active   plugged>
sys-subsystem-net-devices-can1.device                                                                                                       loaded    active   plugged>
sys-subsystem-net-devices-can2.device                                                                                                       loaded    active   plugged>
sys-subsystem-net-devices-can3.device                                                                                                       loaded    active   plugged>
sys-subsystem-net-devices-eth0.device                                                                                                       loaded    active   plugged>
-.mount                                                                                                                                     loaded    active   mounted>
dev-hugepages.mount                                                                                                                         loaded    active   mounted>
dev-mqueue.mount                                                                                                                            loaded    active   mounted>
* home.mount                                                                                                                                  not-found inactive dead   >
media-ram.mount                                                                                                                             loaded    active   mounted>
run-media-boot\x2dmmcblk1p1.mount                                                                                                           loaded    active   mounted>
run-media-mmcblk0p1.mount                                                                                                                   loaded    active   mounted>
run-media-mmcblk0p2.mount                                                                                                                   loaded    active   mounted>
run-user-0.mount                                                                                                                            loaded    active   mounted>
sys-fs-fuse-connections.mount                                                                                                               loaded    active   mounted>
sys-kernel-config.mount                                                                                                                     loaded    active   mounted>
sys-kernel-debug.mount                                                                                                                      loaded    active   mounted>
sys-kernel-tracing.mount                                                                                                                    loaded    inactive dead   >
tmp.mount                                                                                                                                   loaded    active   mounted>
var-volatile.mount                                                                                                                          loaded    active   mounted>
systemd-ask-password-console.path                                                                                                           loaded    active   waiting>
systemd-ask-password-wall.path                                                                                                              loaded    active   waiting>
init.scope                                                                                                                                  loaded    active   running>
session-c2.scope                                                                                                                            loaded    active   running>
alsa-restore.service                                                                                                                        loaded    inactive dead   >
atd.service                                                                                                                                 loaded    active   running>
* auditd.service                                                                                                                              not-found inactive dead   >
avahi-daemon.service                                                                                                                        loaded    active   running>
* bt-enable.service                                                                                                                           loaded    failed   failed >
* connman.service                                                                                                                             not-found inactive dead   >
console-kit-log-system-start.service                                                                                                        loaded    active   exited >
containerd.service                                                                                                                          loaded    active   running>
crond.service                                                                                                                               loaded    active   running>
dbus-broker.service                                                                                                                         loaded    active   running>
demo.service                                                                                                                                loaded    active   exited >
* display-manager.service                                                                                                                     not-found inactive dead   >
* docker.service                                                                                                                              loaded    failed   failed >
* dropbear.service                                                                                                                            not-found inactive dead   >
edgeai-init.service                                                                                                                         loaded    inactive dead   >
emergency.service                                                                                                                           loaded    inactive dead   >
* firewalld.service                                                                                                                           not-found inactive dead   >
getty@tty1.service                                                                                                                          loaded    active   running>
* gplv3-notice.service                                                                                                                        loaded    failed   failed >
initrd-cleanup.service                                                                                                                      loaded    inactive dead   >
initrd-parse-etc.service                                                                                                                    loaded    inactive dead   >
initrd-switch-root.service                                                                                                                  loaded    inactive dead   >
initrd-udevadm-cleanup-db.service                                                                                                           loaded    inactive dead   >
ip6tables.service                                                                                                                           loaded    active   exited >
iptables.service                                                                                                                            loaded    active   exited >
irqbalanced.service                                                                                                                         loaded    active   running>
kdump.service                                                                                                                               loaded    active   exited >
kmod-static-nodes.service                                                                                                                   loaded    active   exited >
ldconfig.service                                                                                                                            loaded    inactive dead   >
logrotate.service                                                                                                                           loaded    inactive dead   >
modprobe@configfs.service                                                                                                                   loaded    inactive dead   >
modprobe@drm.service                                                                                                                        loaded    inactive dead   >
modprobe@fuse.service                                                                                                                       loaded    inactive dead   >
netserver.service                                                                                                                           loaded    active   running>
nfs-statd.service                                                                                                                           loaded    active   running>
ofono.service                                                                                                                               loaded    active   running>
pcscd.service                                                                                                                               loaded    inactive dead   >
* plymouth-quit-wait.service                                                                                                                  not-found inactive dead   >
* plymouth-start.service                                                                                                                      not-found inactive dead   >
* psplash-start.service                                                                                                                       loaded    failed   failed >
psplash-systemd.service                                                                                                                     loaded    inactive dead   >
pulseaudio.service                                                                                                                          loaded    active   running>
rc-local.service                                                                                                                            loaded    inactive dead   >
rescue.service                                                                                                                              loaded    inactive dead   >
resize_rootfs.service                                                                                                                       loaded    active   exited >
rpcbind.service                                                                                                                             loaded    active   running>
* run-postinsts.service                                                                                                                       not-found inactive dead   >
serial-getty@ttyS2.service                                                                                                                  loaded    active   running>
snmpd.service                                                                                                                               loaded    active   running>
startwlanap.service                                                                                                                         loaded    active   exited >
startwlansta.service                                                                                                                        loaded    active   exited >
strongswan-starter.service                                                                                                                  loaded    active   running>
* sync-clocks.service                                                                                                                         loaded    failed   failed >
* syslog.service                                                                                                                              not-found inactive dead   >
systemd-ask-password-console.service                                                                                                        loaded    inactive dead   >
systemd-ask-password-wall.service                                                                                                           loaded    inactive dead   >
systemd-fsck-root.service                                                                                                                   loaded    inactive dead   >
systemd-fsck@dev-mmcblk0p1.service                                                                                                          loaded    active   exited >
systemd-fsck@dev-mmcblk0p2.service                                                                                                          loaded    active   exited >
systemd-fsck@dev-mmcblk1p1.service                                                                                                          loaded    active   exited >
systemd-hwdb-update.service                                                                                                                 loaded    inactive dead   >
systemd-initctl.service                                                                                                                     loaded    inactive dead   >
systemd-journal-catalog-update.service                                                                                                      loaded    inactive dead   >
systemd-journal-flush.service                                                                                                               loaded    active   exited >
systemd-journald.service                                                                                                                    loaded    active   running>
systemd-logind.service                                                                                                                      loaded    active   running>
systemd-machine-id-commit.service                                                                                                           loaded    inactive dead   >
systemd-modules-load.service                                                                                                                loaded    active   exited >
systemd-network-generator.service                                                                                                           loaded    active   exited >
* systemd-networkd-wait-online.service                                                                                                        loaded    failed   failed >
systemd-networkd.service                                                                                                                    loaded    active   running>
systemd-pstore.service                                                                                                                      loaded    inactive dead   >
systemd-quotacheck.service                                                                                                                  loaded    inactive dead   >
systemd-random-seed.service                                                                                                                 loaded    active   exited >
systemd-remount-fs.service                                                                                                                  loaded    active   exited >
systemd-resolved.service                                                                                                                    loaded    active   running>
systemd-rfkill.service                                                                                                                      loaded    inactive dead   >
systemd-sysctl.service                                                                                                                      loaded    active   exited >
systemd-sysusers.service                                                                                                                    loaded    inactive dead   >
systemd-timesyncd.service                                                                                                                   loaded    active   running>
systemd-tmpfiles-clean.service                                                                                                              loaded    inactive dead   >
systemd-tmpfiles-setup-dev.service                                                                                                          loaded    active   exited >
systemd-tmpfiles-setup.service                                                                                                              loaded    active   exited >
systemd-udev-settle.service                                                                                                                 loaded    inactive dead   >
systemd-udev-trigger.service                                                                                                                loaded    active   exited >
systemd-udevd.service                                                                                                                       loaded    active   running>
systemd-update-done.service                                                                                                                 loaded    inactive dead   >
systemd-update-utmp-runlevel.service                                                                                                        loaded    inactive dead   >
systemd-update-utmp.service                                                                                                                 loaded    active   exited >
systemd-user-sessions.service                                                                                                               loaded    active   exited >
systemd-userdbd.service                                                                                                                     loaded    active   running>
systemd-vconsole-setup.service                                                                                                              loaded    inactive dead   >
tee-supplicant.service                                                                                                                      loaded    active   running>
telnetd.service                                                                                                                             loaded    active   exited >
* ti-apps-launcher.service                                                                                                                    loaded    failed   failed >
user-runtime-dir@0.service                                                                                                                  loaded    active   exited >
user@0.service                                                                                                                              loaded    active   running>
var-volatile-cache.service                                                                                                                  loaded    inactive dead   >
var-volatile-lib.service                                                                                                                    loaded    inactive dead   >
var-volatile-spool.service                                                                                                                  loaded    inactive dead   >
var-volatile-srv.service                                                                                                                    loaded    inactive dead   >
weston.service                                                                                                                              loaded    inactive dead   >
-.slice                                                                                                                                     loaded    active   active >
system-getty.slice                                                                                                                          loaded    active   active >
system-modprobe.slice                                                                                                                       loaded    active   active >
system-serial\x2dgetty.slice                                                                                                                loaded    active   active >
system-systemd\x2dcoredump.slice                                                                                                            loaded    active   active >
system-systemd\x2dfsck.slice                                                                                                                loaded    active   active >
system.slice                                                                                                                                loaded    active   active >
user-0.slice                                                                                                                                loaded    active   active >
user.slice                                                                                                                                  loaded    active   active >
avahi-daemon.socket                                                                                                                         loaded    active   running>
dbus.socket                                                                                                                                 loaded    active   running>
* docker.socket                                                                                                                               loaded    failed   failed >
dropbear.socket                                                                                                                             loaded    active   listeni>
pcscd.socket                                                                                                                                loaded    active   listeni>
rpcbind.socket                                                                                                                              loaded    active   running>
syslog.socket                                                                                                                               loaded    inactive dead   >
systemd-coredump.socket                                                                                                                     loaded    active   listeni>
systemd-initctl.socket                                                                                                                      loaded    active   listeni>
systemd-journald-audit.socket                                                                                                               loaded    active   running>
systemd-journald-dev-log.socket                                                                                                             loaded    active   running>
systemd-journald.socket                                                                                                                     loaded    active   running>
systemd-networkd.socket                                                                                                                     loaded    active   running>
systemd-rfkill.socket                                                                                                                       loaded    active   listeni>
systemd-udevd-control.socket                                                                                                                loaded    active   running>
systemd-udevd-kernel.socket                                                                                                                 loaded    active   running>
systemd-userdbd.socket                                                                                                                      loaded    active   running>
weston.socket                                                                                                                               loaded    active   listeni>
basic.target                                                                                                                                loaded    active   active >
blockdev@dev-mmcblk0p1.target                                                                                                               loaded    inactive dead   >
blockdev@dev-mmcblk0p2.target                                                                                                               loaded    inactive dead   >
blockdev@dev-mmcblk1p1.target                                                                                                               loaded    inactive dead   >
blockdev@dev-root.target                                                                                                                    loaded    inactive dead   >
* cryptsetup.target                                                                                                                           not-found inactive dead   >
emergency.target                                                                                                                            loaded    inactive dead   >
first-boot-complete.target                                                                                                                  loaded    inactive dead   >
getty-pre.target                                                                                                                            loaded    inactive dead   >
getty.target                                                                                                                                loaded    active   active >
graphical.target                                                                                                                            loaded    active   active >
initrd-fs.target                                                                                                                            loaded    inactive dead   >
initrd-root-device.target                                                                                                                   loaded    inactive dead   >
initrd-root-fs.target                                                                                                                       loaded    inactive dead   >
initrd-switch-root.target                                                                                                                   loaded    inactive dead   >
initrd-usr-fs.target                                                                                                                        loaded    inactive dead   >
initrd.target                                                                                                                               loaded    inactive dead   >
local-fs-pre.target                                                                                                                         loaded    active   active >
local-fs.target                                                                                                                             loaded    active   active >
multi-user.target                                                                                                                           loaded    active   active >
network-online.target                                                                                                                       loaded    active   active >
network-pre.target                                                                                                                          loaded    active   active >
network.target                                                                                                                              loaded    active   active >
nss-lookup.target                                                                                                                           loaded    active   active >
nss-user-lookup.target                                                                                                                      loaded    inactive dead   >
paths.target                                                                                                                                loaded    active   active >
remote-fs-pre.target                                                                                                                        loaded    inactive dead   >
remote-fs.target                                                                                                                            loaded    active   active >
rescue.target                                                                                                                               loaded    inactive dead   >
rpcbind.target                                                                                                                              loaded    active   active >
shutdown.target                                                                                                                             loaded    inactive dead   >
slices.target                                                                                                                               loaded    active   active >
sockets.target                                                                                                                              loaded    active   active >
swap.target                                                                                                                                 loaded    active   active >
sysinit.target                                                                                                                              loaded    active   active >
* syslog.target                                                                                                                               not-found inactive dead   >
time-set.target                                                                                                                             loaded    active   active >
time-sync.target                                                                                                                            loaded    inactive dead   >
timers.target                                                                                                                               loaded    active   active >
umount.target                                                                                                                               loaded    inactive dead   >
logrotate.timer                                                                                                                             loaded    active   waiting>
systemd-tmpfiles-clean.timer                                                                                                                loaded    active   waiting>

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.
314 loaded units listed.
To show all installed unit files use 'systemctl list-unit-files'.

Sockets opened in AM69A:
- root@am69-sk:~# lsof -i
  COMMAND   PID            USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
  systemd     1            root   30u IPv4   2597      0t0 TCP *:sunrpc (LISTEN)
  systemd     1            root   31u IPv4   2598      0t0 UDP *:sunrpc
  systemd     1            root   32u IPv6   2599      0t0 TCP *:sunrpc (LISTEN)
  systemd     1            root   33u IPv6   2600      0t0 UDP *:sunrpc
  systemd     1            root   52u IPv6   9800      0t0 TCP *:ssh (LISTEN)
  rpcbind   235             rpc    4u IPv4   2597      0t0 TCP *:sunrpc (LISTEN)
  rpcbind   235             rpc    5u IPv4   2598      0t0 UDP *:sunrpc
  rpcbind   235             rpc    6u IPv6   2599      0t0 TCP *:sunrpc (LISTEN)
  rpcbind   235             rpc    7u IPv6   2600      0t0 UDP *:sunrpc
  telnetd   750            root    3u IPv6 11146      0t0 TCP *:telnet (LISTEN)
  charon    813            root   10u IPv6 11512      0t0 UDP *:isakmp
  charon    813            root   11u IPv6 11513      0t0 UDP *:ipsec-nat-t
  charon    813            root   12u IPv4 11514      0t0 UDP *:isakmp
  charon    813            root   13u IPv4 11515      0t0 UDP *:ipsec-nat-t
  systemd-r 827 systemd-resolve   11u IPv4   8667      0t0 UDP *:5355
  systemd-r 827 systemd-resolve   12u IPv4   8668      0t0 TCP *:5355 (LISTEN)
  systemd-r 827 systemd-resolve   13u IPv6   8670      0t0 UDP *:5355
  systemd-r 827 systemd-resolve   14u IPv6   8671      0t0 TCP *:5355 (LISTEN)
  systemd-r 827 systemd-resolve   17u IPv4   8673      0t0 UDP 127.0.0.53:domain
  systemd-r 827 systemd-resolve   18u IPv4   8674      0t0 TCP 127.0.0.53:domain (LISTEN)
  systemd-r 827 systemd-resolve   19u IPv4   8675      0t0 UDP 127.0.0.54:domain
  systemd-r 827 systemd-resolve   20u IPv4   8676      0t0 TCP 127.0.0.54:domain (LISTEN)
  avahi-dae 855           avahi   12u IPv4   9999      0t0 UDP *:mdns
  avahi-dae 855           avahi   13u IPv6 10000      0t0 UDP *:mdns
  avahi-dae 855           avahi   14u IPv4 10001      0t0 UDP *:53247
  avahi-dae 855           avahi   15u IPv6 10002      0t0 UDP *:51917
  netserver 858            root    3u IPv6 11497      0t0 TCP *:12865 (LISTEN)
  rpc.statd 859         rpcuser    4u IPv4    922      0t0 UDP localhost:611
  rpc.statd 859         rpcuser    7u IPv4    926      0t0 UDP *:47974
  rpc.statd 859         rpcuser    8u IPv4    928      0t0 TCP *:36603 (LISTEN)
  rpc.statd 859         rpcuser    9u IPv6    930      0t0 UDP *:36670
  rpc.statd 859         rpcuser   10u IPv6    932      0t0 TCP *:51929 (LISTEN)
  snmpd     860            root    6u IPv4   8764      0t0 UDP *:snmp
  snmpd     860            root    7u IPv4   8765      0t0 TCP *:smux (LISTEN)
  container 867            root   14u IPv4    959      0t0 TCP localhost:41253 (LISTEN)
  root@am69-sk:~#
AM69 Dropbear version: v2020.81

Thanks in advance

10 months ago

0 Y. Bas 10 months ago

Prodigy 41 points

Besides that, according to SSH error specified in CCS as "Algorithm Negotiation Error" , we have compared SSH key exchange methods for both CCS (client) and target system (server). According to wireshark logs server offers following key exchange algorithms:

curve25519-sha256
curve25519-sha256@libssh.org
ecdh-sha2-nistp521
ecdh-sha2-nistp384
ecdh-sha2-nistp256
diffie-hellman-group14-sha256
kexguess2@matt.ucc.asn.au

Client offers:

diffie-hellman-group-exchange-sha256
diffie-hellman-group1-sha1
diffie-hellman-group14-sha1
diffie-hellman-group-exchange-sha1

This is the first potential cause of the negotiation failure: there is no overlap in the key exchange algorithms.

In addition to key exchange (kex) algorithms, we have analyzed server-host algorithms, encryption algs, MAC algs, and compression algs. However these parameters specified by both ends match each other, therefore these algorithms are not likely to be the issue.

In this case, modifying either client or server side ssh configuration might be helpful. We have modified server side (Dropbear) configuration by specifying kex algs. in /etc/default/dropbear as following:

Fullscreen
1
DROPBEAR_EXTRA_ARGS="-B -KexAlgorithms curve25519-sha256,diffie-hellman-group14-sha256,diffie-hellman-group-exchange-sha256 -Ciphers aes128-ctr,aes256-ctr -MACs hmac-sha1,hmac-sha2-256"
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
```
DROPBEAR_EXTRA_ARGS="-B -KexAlgorithms curve25519-sha256,diffie-hellman-group14-sha256,diffie-hellman-group-exchange-sha256 -Ciphers aes128-ctr,aes256-ctr -MACs hmac-sha1,hmac-sha2-256" 
```

However after modifying content we get "Session.connect: java.net.SocketException: Connection reset" in CCS because server immediately closes connection. Do you have any advice on server parameter modification?

Thanks,

+1 Y. Bas 9 months ago in reply to Y. Bas

Prodigy 41 points

Hi all,

The problem arises from the mismatch between kex(key exchange) algorithms proposed by CCS 12 and dropbear (v2020.x) running on the target. There are 4 kex alg. available in SSH configuration in CCS, however none of them match with target's one because they are considered relatively less secure. In order to solve the problem,

We have downloaded dropbear's last version, (as of date it is 2024.85),
Edit ".github/workflows/build.yml" located in dropbear folder, by enabling DH Group 14 algs. by setting all values of DROPBEAR_DH_GROUP14_SHA1 as "1" and DROPBEAR_DH_GROUP14_SHA256 as "1"
Dropbear , also, supports password-based authentication. Hence, in order to compile dropbear , first we need to compile crypo-libraries.
We have downloaded libxcrypt's last version (as of date it is 4.4.36)
If you do not have compiler for aarch64, download required packets.
Configure, compile libxcrypt, and install it to both your host pc and target system.
Compile dropbear and install it your target file system.
Set root password in your target system by issuing "passwd root" command.
Modify /etc/default/dropbear in your target system as following: DROPBEAR_EXTRA_ARGS=" -R"

After updating and configuring dropbear in target system, we have achieved to establish SSH connection, RSE connection, and debug target system by gdb .

Processors

Processors forum

AM69A: SSH "Algorithm negotiation fail" error in CCS 12