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Linux: git.omapzoom.org[0: 198.47.28.210]: errno=Connection refused

Tool/software: Linux

when i want to fetch source code (executed fetch_source.sh), it failed , show error message like below:

"

fatal: unable to connect to git.omapzoom.org:
git.omapzoom.org[0: 198.47.28.210]: errno=Connection refused

"

even i try fetch source code via a VPN, it is the same error.

and i nmap the git.omapzoom.org:

"

Starting Nmap 6.40 ( http://nmap.org ) at 2018-12-30 18:03 PST
Nmap scan report for git.omapzoom.org (198.47.28.210)
Host is up (0.28s latency).
PORT STATE SERVICE
80/tcp open http
8008/tcp filtered http
9418/tcp filtered git

"

and i try fetch source manually

"git clone http://git.omapzoom.org/kernel/omap.git"

"git clone git://git.omapzoom.org/kernel/omap.git"

but always failed...

"

$ git clone git://git.omapzoom.org/kernel/omap.git
Cloning into 'omap'...
fatal: unable to connect to git.omapzoom.org:
git.omapzoom.org[0: 198.47.28.210]: errno=Invalid argument

"

"

$ git clone git.omapzoom.org/.../omap.git
Cloning into 'omap'...
error: Unable to get pack index git.omapzoom.org/.../pack-490026bd27b456719a336d932f6a7f6779c9a8d2.idx
error: Unable to find f5f1aabd7b9a6c8c13ab6115c49b42c6b1ae30e7 under git.omapzoom.org/.../omap.git
Cannot obtain needed object f5f1aabd7b9a6c8c13ab6115c49b42c6b1ae30e7
error: fetch failed.

"

please help me how to solve this ?