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ssh: connect to host 192.168.0.53 port 22: Connection refused

Sourabh Patil
Prodigy 146 points
Other Parts Discussed in Thread: TDA4VM

Hi,

I am using TDA4VM (J721E) board with SDK 09_00_00_00.

I have been using the board remotely, with ssh from my computer (as instructed in documentation https://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-edgeai/TDA4VM/09_00_00/exports/docs/devices/TDA4VM/linux/getting_started.html ). But now I am getting "ssh: connect to host 192.168.0.53 port 22: Connection refused" error. What is the reason? I can ping to the board's IP but could not establish ssh session. Sometimes I am able to connect through ssh but it gets disconnected abruptly. It is a confusing behavior as it never happened in the past but it is happening now persistently.

P.S. I can ping from my computer to the board but when I do the same from terminal of board, it is random, sometimes ping is established but sometimes there is very large delay. I observed that whenever there is smooth ping from board to my system, I can establish ssh swiftly from my system to board and if delay comes in ping from board to my system the ssh session is exited.

Thanks and regards,
Sourabh

  • 0
    Prodigy 146 points

    I ran a ping statistics test from my laptop to my board and vice versa.
    From my system to the board there is 0 % packet loss.
    From board to my system there is 19 % packet loss.
    I also tried to install openssh-server using apt but as linux distribution on the board is arago which is specific for TI boards I suppose. Kindly let me know about the RCA and if not then flashing the SD card again will work?

    Regards,
    Sourabh

  • 0 in reply to Sourabh Patil
    TI__Guru 64610 points

    Hi,

    Can you dump CPSW statistics, just before ping test and after certain pin count (ex: after 50 pings) and share the log with us.

    Best Regards,
    Sudheer

  • 0 in reply to Doredla Sudheer Kumar
    Prodigy 146 points

    Hi Sudheer,

    Sharing the stats after and before ping test for 100 packets.

    Fullscreen cpsw_stats_after_100_packets.txt Download 
    NIC statistics:
     p0_rx_good_frames: 424
     p0_rx_broadcast_frames: 4
     p0_rx_multicast_frames: 42
     p0_rx_crc_errors: 0
     p0_rx_oversized_frames: 0
     p0_rx_undersized_frames: 0
     p0_ale_drop: 0
     p0_ale_overrun_drop: 0
     p0_rx_octets: 67898
     p0_tx_good_frames: 1399
     p0_tx_broadcast_frames: 966
     p0_tx_multicast_frames: 9
     p0_tx_octets: 126366
     p0_tx_64B_frames: 859
     p0_tx_65_to_127B_frames: 610
     p0_tx_128_to_255B_frames: 290
     p0_tx_256_to_511B_frames: 43
     p0_tx_512_to_1023B_frames: 14
     p0_tx_1024B_frames: 7
     p0_net_octets: 194264
     p0_rx_bottom_fifo_drop: 0
     p0_rx_port_mask_drop: 0
     p0_rx_top_fifo_drop: 0
     p0_ale_rate_limit_drop: 0
     p0_ale_vid_ingress_drop: 0
     p0_ale_da_eq_sa_drop: 0
     p0_ale_block_drop: 0
     p0_ale_secure_drop: 0
     p0_ale_auth_drop: 0
     p0_ale_unknown_ucast: 0
     p0_ale_unknown_ucast_bytes: 0
     p0_ale_unknown_mcast: 0
     p0_ale_unknown_mcast_bytes: 0
     p0_ale_unknown_bcast: 0
     p0_ale_unknown_bcast_bytes: 0
     p0_ale_pol_match: 0
     p0_ale_pol_match_red: 0
     p0_ale_pol_match_yellow: 0
     p0_ale_mcast_sa_drop: 0
     p0_ale_dual_vlan_drop: 0
     p0_ale_len_err_drop: 0
     p0_ale_ip_next_hdr_drop: 0
     p0_ale_ipv4_frag_drop: 0
     p0_tx_mem_protect_err: 0
     p0_tx_pri0: 0
     p0_tx_pri1: 0
     p0_tx_pri2: 0
     p0_tx_pri3: 0
     p0_tx_pri4: 0
     p0_tx_pri5: 0
     p0_tx_pri6: 0
     p0_tx_pri7: 0
     p0_tx_pri0_bcnt: 0
     p0_tx_pri1_bcnt: 0
     p0_tx_pri2_bcnt: 0
     p0_tx_pri3_bcnt: 0
     p0_tx_pri4_bcnt: 0
     p0_tx_pri5_bcnt: 0
     p0_tx_pri6_bcnt: 0
     p0_tx_pri7_bcnt: 0
     p0_tx_pri0_drop: 0
     p0_tx_pri1_drop: 0
     p0_tx_pri2_drop: 0
     p0_tx_pri3_drop: 0
     p0_tx_pri4_drop: 0
     p0_tx_pri5_drop: 0
     p0_tx_pri6_drop: 0
     p0_tx_pri7_drop: 0
     p0_tx_pri0_drop_bcnt: 0
     p0_tx_pri1_drop_bcnt: 0
     p0_tx_pri2_drop_bcnt: 0
     p0_tx_pri3_drop_bcnt: 0
     p0_tx_pri4_drop_bcnt: 0
     p0_tx_pri5_drop_bcnt: 0
     p0_tx_pri6_drop_bcnt: 0
     p0_tx_pri7_drop_bcnt: 0
     rx_good_frames: 1586
     rx_broadcast_frames: 966
     rx_multicast_frames: 196
     rx_pause_frames: 0
     rx_crc_errors: 0
     rx_align_code_errors: 0
     rx_oversized_frames: 0
     rx_jabber_frames: 0
     rx_undersized_frames: 0
     rx_fragments: 0
     ale_drop: 187
     ale_overrun_drop: 0
     rx_octets: 196001
     tx_good_frames: 424
     tx_broadcast_frames: 4
     tx_multicast_frames: 42
     tx_pause_frames: 0
     tx_deferred_frames: 0
     tx_collision_frames: 0
     tx_single_coll_frames: 0
     tx_mult_coll_frames: 0
     tx_excessive_collisions: 0
     tx_late_collisions: 0
     rx_ipg_error: 0
     tx_carrier_sense_errors: 0
     tx_octets: 67898
     tx_64B_frames: 859
     tx_65_to_127B_frames: 610
     tx_128_to_255B_frames: 373
     tx_256_to_511B_frames: 95
     tx_512_to_1023B_frames: 66
     tx_1024B_frames: 7
     net_octets: 263899
     rx_bottom_fifo_drop: 0
     rx_port_mask_drop: 187
     rx_top_fifo_drop: 0
     ale_rate_limit_drop: 0
     ale_vid_ingress_drop: 0
     ale_da_eq_sa_drop: 0
     ale_block_drop: 0
     ale_secure_drop: 0
     ale_auth_drop: 0
     ale_unknown_ucast: 424
     ale_unknown_ucast_bytes: 52386
     ale_unknown_mcast: 196
     ale_unknown_mcast_bytes: 70211
     ale_unknown_bcast: 966
     ale_unknown_bcast_bytes: 73404
     ale_pol_match: 0
     ale_pol_match_red: 0
     ale_pol_match_yellow: 0
     ale_mcast_sa_drop: 0
     ale_dual_vlan_drop: 0
     ale_len_err_drop: 0
     ale_ip_next_hdr_drop: 0
     ale_ipv4_frag_drop: 0
     iet_rx_assembly_err: 0
     iet_rx_assembly_ok: 0
     iet_rx_smd_err: 0
     iet_rx_frag: 0
     iet_tx_hold: 0
     iet_tx_frag: 0
     tx_mem_protect_err: 0
     tx_pri0: 424
     tx_pri1: 0
     tx_pri2: 0
     tx_pri3: 0
     tx_pri4: 0
     tx_pri5: 0
     tx_pri6: 0
     tx_pri7: 0
     tx_pri0_bcnt: 67898
     tx_pri1_bcnt: 0
     tx_pri2_bcnt: 0
     tx_pri3_bcnt: 0
     tx_pri4_bcnt: 0
     tx_pri5_bcnt: 0
     tx_pri6_bcnt: 0
     tx_pri7_bcnt: 0
     tx_pri0_drop: 0
     tx_pri1_drop: 0
     tx_pri2_drop: 0
     tx_pri3_drop: 0
     tx_pri4_drop: 0
     tx_pri5_drop: 0
     tx_pri6_drop: 0
     tx_pri7_drop: 0
     tx_pri0_drop_bcnt: 0
     tx_pri1_drop_bcnt: 0
     tx_pri2_drop_bcnt: 0
     tx_pri3_drop_bcnt: 0
     tx_pri4_drop_bcnt: 0
     tx_pri5_drop_bcnt: 0
     tx_pri6_drop_bcnt: 0
     tx_pri7_drop_bcnt: 0
    Fullscreen cpsw_stats_before.txt Download 
    NIC statistics:
     p0_rx_good_frames: 75
     p0_rx_broadcast_frames: 4
     p0_rx_multicast_frames: 40
     p0_rx_crc_errors: 0
     p0_rx_oversized_frames: 0
     p0_rx_undersized_frames: 0
     p0_ale_drop: 0
     p0_ale_overrun_drop: 0
     p0_rx_octets: 8840
     p0_tx_good_frames: 507
     p0_tx_broadcast_frames: 476
     p0_tx_multicast_frames: 4
     p0_tx_octets: 38706
     p0_tx_64B_frames: 424
     p0_tx_65_to_127B_frames: 102
     p0_tx_128_to_255B_frames: 48
     p0_tx_256_to_511B_frames: 8
     p0_tx_512_to_1023B_frames: 0
     p0_tx_1024B_frames: 0
     p0_net_octets: 47546
     p0_rx_bottom_fifo_drop: 0
     p0_rx_port_mask_drop: 0
     p0_rx_top_fifo_drop: 0
     p0_ale_rate_limit_drop: 0
     p0_ale_vid_ingress_drop: 0
     p0_ale_da_eq_sa_drop: 0
     p0_ale_block_drop: 0
     p0_ale_secure_drop: 0
     p0_ale_auth_drop: 0
     p0_ale_unknown_ucast: 0
     p0_ale_unknown_ucast_bytes: 0
     p0_ale_unknown_mcast: 0
     p0_ale_unknown_mcast_bytes: 0
     p0_ale_unknown_bcast: 0
     p0_ale_unknown_bcast_bytes: 0
     p0_ale_pol_match: 0
     p0_ale_pol_match_red: 0
     p0_ale_pol_match_yellow: 0
     p0_ale_mcast_sa_drop: 0
     p0_ale_dual_vlan_drop: 0
     p0_ale_len_err_drop: 0
     p0_ale_ip_next_hdr_drop: 0
     p0_ale_ipv4_frag_drop: 0
     p0_tx_mem_protect_err: 0
     p0_tx_pri0: 0
     p0_tx_pri1: 0
     p0_tx_pri2: 0
     p0_tx_pri3: 0
     p0_tx_pri4: 0
     p0_tx_pri5: 0
     p0_tx_pri6: 0
     p0_tx_pri7: 0
     p0_tx_pri0_bcnt: 0
     p0_tx_pri1_bcnt: 0
     p0_tx_pri2_bcnt: 0
     p0_tx_pri3_bcnt: 0
     p0_tx_pri4_bcnt: 0
     p0_tx_pri5_bcnt: 0
     p0_tx_pri6_bcnt: 0
     p0_tx_pri7_bcnt: 0
     p0_tx_pri0_drop: 0
     p0_tx_pri1_drop: 0
     p0_tx_pri2_drop: 0
     p0_tx_pri3_drop: 0
     p0_tx_pri4_drop: 0
     p0_tx_pri5_drop: 0
     p0_tx_pri6_drop: 0
     p0_tx_pri7_drop: 0
     p0_tx_pri0_drop_bcnt: 0
     p0_tx_pri1_drop_bcnt: 0
     p0_tx_pri2_drop_bcnt: 0
     p0_tx_pri3_drop_bcnt: 0
     p0_tx_pri4_drop_bcnt: 0
     p0_tx_pri5_drop_bcnt: 0
     p0_tx_pri6_drop_bcnt: 0
     p0_tx_pri7_drop_bcnt: 0
     rx_good_frames: 590
     rx_broadcast_frames: 476
     rx_multicast_frames: 87
     rx_pause_frames: 0
     rx_crc_errors: 0
     rx_align_code_errors: 0
     rx_oversized_frames: 0
     rx_jabber_frames: 0
     rx_undersized_frames: 0
     rx_fragments: 0
     ale_drop: 83
     ale_overrun_drop: 0
     rx_octets: 70149
     tx_good_frames: 75
     tx_broadcast_frames: 4
     tx_multicast_frames: 40
     tx_pause_frames: 0
     tx_deferred_frames: 0
     tx_collision_frames: 0
     tx_single_coll_frames: 0
     tx_mult_coll_frames: 0
     tx_excessive_collisions: 0
     tx_late_collisions: 0
     rx_ipg_error: 0
     tx_carrier_sense_errors: 0
     tx_octets: 8840
     tx_64B_frames: 424
     tx_65_to_127B_frames: 102
     tx_128_to_255B_frames: 83
     tx_256_to_511B_frames: 32
     tx_512_to_1023B_frames: 24
     tx_1024B_frames: 0
     net_octets: 78989
     rx_bottom_fifo_drop: 0
     rx_port_mask_drop: 83
     rx_top_fifo_drop: 0
     ale_rate_limit_drop: 0
     ale_vid_ingress_drop: 0
     ale_da_eq_sa_drop: 0
     ale_block_drop: 0
     ale_secure_drop: 0
     ale_auth_drop: 0
     ale_unknown_ucast: 27
     ale_unknown_ucast_bytes: 3114
     ale_unknown_mcast: 87
     ale_unknown_mcast_bytes: 31699
     ale_unknown_bcast: 476
     ale_unknown_bcast_bytes: 35336
     ale_pol_match: 0
     ale_pol_match_red: 0
     ale_pol_match_yellow: 0
     ale_mcast_sa_drop: 0
     ale_dual_vlan_drop: 0
     ale_len_err_drop: 0
     ale_ip_next_hdr_drop: 0
     ale_ipv4_frag_drop: 0
     iet_rx_assembly_err: 0
     iet_rx_assembly_ok: 0
     iet_rx_smd_err: 0
     iet_rx_frag: 0
     iet_tx_hold: 0
     iet_tx_frag: 0
     tx_mem_protect_err: 0
     tx_pri0: 75
     tx_pri1: 0
     tx_pri2: 0
     tx_pri3: 0
     tx_pri4: 0
     tx_pri5: 0
     tx_pri6: 0
     tx_pri7: 0
     tx_pri0_bcnt: 8840
     tx_pri1_bcnt: 0
     tx_pri2_bcnt: 0
     tx_pri3_bcnt: 0
     tx_pri4_bcnt: 0
     tx_pri5_bcnt: 0
     tx_pri6_bcnt: 0
     tx_pri7_bcnt: 0
     tx_pri0_drop: 0
     tx_pri1_drop: 0
     tx_pri2_drop: 0
     tx_pri3_drop: 0
     tx_pri4_drop: 0
     tx_pri5_drop: 0
     tx_pri6_drop: 0
     tx_pri7_drop: 0
     tx_pri0_drop_bcnt: 0
     tx_pri1_drop_bcnt: 0
     tx_pri2_drop_bcnt: 0
     tx_pri3_drop_bcnt: 0
     tx_pri4_drop_bcnt: 0
     tx_pri5_drop_bcnt: 0
     tx_pri6_drop_bcnt: 0
     tx_pri7_drop_bcnt: 0

    There was around 13% packet loss this time.

    Regards,
    Sourabh

  • 0 in reply to Sourabh Patil
    TI__Guru** 112055 points

    Hi Sourabh,

    Sudheer is out of office due to a TI regional holiday, and will follow-up once he is back in office later this week.

    regards

    Suman

  • 0 in reply to Suman Anna
    Prodigy 146 points

    Hi Suman,

    Thanks for the update. Awaiting the solution as I need to deploy and test some of the compiled models on the board.

    Regards,
    Sourabh

  • 0 in reply to Sourabh Patil
    TI__Mastermind 38880 points

    Hi Sourabh,

    1. Can you please tell me about your system. Are there any firewalls in place?
    2. Can you tell me if your TDA4VM is idle or is there something running n the board when the issue is observed.
    3. Can you please recheck the connection between the system and the board if there is some loose connection between them. Is the connection direct or is it coming via a router?

    Regards,
    Tanmay

  • 0 in reply to Tanmay Patil
    Prodigy 146 points

    Hi Tanmay,

    1. No it is inactive.
    2. Nothing is running on the board. I fire it up and then try to connect in via ssh or sftp (which I used to do earlier too and it used to establish uninterrupted connection)
    3. I have been establishing the connection to the board via a router.

    Regards,
    Sourabh

  • 0 in reply to Sourabh Patil
    TI__Mastermind 38880 points

    Hi Saurabh,

    Sourabh Patil said:
    I have been establishing the connection to the board via a router.

    In this case, were there any changes in the router settings? Like forwarding with some VLAN or something else as well. According to the statistics dump, there was ~10% packet drop observed due to port mask. What this means is that for almost 10% of the rx packets, the packets which arrived were not supposed to be forwarded to the host port according to CPSW's routing rules.

    Is it possible for you to check the connection between two boards instead of board and system?

    Regards,
    Tanmay

  • +1 in reply to Tanmay Patil
    Prodigy 146 points

    Hi Tanmay,

    Thanks for replying. I found the issue. The issue was with our internal network connection I suppose. There is specific IP, if that IP gets assigned to the board then there is packet loss issue resulting in unreliable ssh session (probably it is getting assigned to multiple devices). For other IP the ssh tunneling is working as expected. Thanks for your support.

    Regards,
    Sourabh