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intermittent ssh access (succeeds ~5%) #2055

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opened 2025年07月27日 19:07:05 +02:00 by alexishuxley · 7 comments

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From two different locations I am getting:

damson$ ssh -T codeberg.org
kex_exchange_identification: Connection closed by remote host
Connection closed by 217.197.84.140 port 22
damson$

If I try several times then occassionally, maybe 5% of the time, it works.

Obviously I'm not interested in running that ssh command; I was attempting to push and that was failing, so went back to basics. This started some time between Sunday 27 July 08:33 UTC and 16:04.

In order to help track this on the ssh server, here's the same time with UTC timestamps and -v:

damson$ TZ=UTC date; ssh -v -T codeberg.org; TZ=UTC date
Sun 27 Jul 17:05:26 UTC 2025
OpenSSH_9.2p1 Debian-2+deb12u6, OpenSSL 3.0.16 11 Feb 2025
debug1: Reading configuration data /home/alexis/.ssh/config
debug1: /home/alexis/.ssh/config line 205: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 3: Applying options for *
debug1: Canonicalized hostname "codeberg.org." => "codeberg.org"
debug1: hostname canonicalisation enabled, will re-parse configuration
debug1: re-parsing configuration
debug1: Reading configuration data /home/alexis/.ssh/config
debug1: /home/alexis/.ssh/config line 205: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 3: Applying options for *
debug1: Connecting to codeberg.org [217.197.84.140] port 22.
debug1: Connection established.
debug1: identity file /home/alexis/.ssh/id_ed25519_for_codeberg_access type 3
debug1: identity file /home/alexis/.ssh/id_ed25519_for_codeberg_access-cert type -1
debug1: identity file /home/alexis/.ssh/id_ed25519-root@opam type 3
debug1: identity file /home/alexis/.ssh/id_ed25519-root@opam-cert type -1
debug1: identity file /home/alexis/.ssh/id_rsa-alexis@damson type 0
debug1: identity file /home/alexis/.ssh/id_rsa-alexis@damson-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_9.2p1 Debian-2+deb12u6
kex_exchange_identification: Connection closed by remote host
Connection closed by 217.197.84.140 port 22
Sun 27 Jul 17:05:29 UTC 2025
damson$

Hope that helps!

### Comment From two different locations I am getting: ``` damson$ ssh -T codeberg.org kex_exchange_identification: Connection closed by remote host Connection closed by 217.197.84.140 port 22 damson$ ``` If I try several times then occassionally, maybe 5% of the time, it works. Obviously I'm not interested in running __that__ `ssh` command; I was attempting to push and that was failing, so went back to basics. This started some time between Sunday 27 July 08:33 UTC and 16:04. In order to help track this on the ssh server, here's the same time with UTC timestamps and `-v`: ``` damson$ TZ=UTC date; ssh -v -T codeberg.org; TZ=UTC date Sun 27 Jul 17:05:26 UTC 2025 OpenSSH_9.2p1 Debian-2+deb12u6, OpenSSL 3.0.16 11 Feb 2025 debug1: Reading configuration data /home/alexis/.ssh/config debug1: /home/alexis/.ssh/config line 205: Applying options for * debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 3: Applying options for * debug1: Canonicalized hostname "codeberg.org." => "codeberg.org" debug1: hostname canonicalisation enabled, will re-parse configuration debug1: re-parsing configuration debug1: Reading configuration data /home/alexis/.ssh/config debug1: /home/alexis/.ssh/config line 205: Applying options for * debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 3: Applying options for * debug1: Connecting to codeberg.org [217.197.84.140] port 22. debug1: Connection established. debug1: identity file /home/alexis/.ssh/id_ed25519_for_codeberg_access type 3 debug1: identity file /home/alexis/.ssh/id_ed25519_for_codeberg_access-cert type -1 debug1: identity file /home/alexis/.ssh/id_ed25519-root@opam type 3 debug1: identity file /home/alexis/.ssh/id_ed25519-root@opam-cert type -1 debug1: identity file /home/alexis/.ssh/id_rsa-alexis@damson type 0 debug1: identity file /home/alexis/.ssh/id_rsa-alexis@damson-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_9.2p1 Debian-2+deb12u6 kex_exchange_identification: Connection closed by remote host Connection closed by 217.197.84.140 port 22 Sun 27 Jul 17:05:29 UTC 2025 damson$ ``` Hope that helps!

See also #2054.

See also #2054.

confirming fixed. Thanks!

confirming fixed. Thanks!

This problem is back again. See also #2054.

This problem is back again. See also #2054.

FYI, this is still failing:

farfalle$ for ATTEMPT in {1..5}; do
> ST=$(TZ=UTC date)
> sleep 5
> ssh -T codeberg.org > /dev/null
> RC=$?
> ET=$(TZ=UTC date)
> if [ $RC != 0 ]; then 
> echo "($ST - $ET)"
> echo
> fi
> done
kex_exchange_identification: Connection closed by remote host
Connection closed by 217.197.84.140 port 22
(Tue 29 Jul 10:30:58 UTC 2025 - Tue 29 Jul 10:31:06 UTC 2025)
farfalle$
FYI, this is still failing: ``` farfalle$ for ATTEMPT in {1..5}; do > ST=$(TZ=UTC date) > sleep 5 > ssh -T codeberg.org > /dev/null > RC=$? > ET=$(TZ=UTC date) > if [ $RC != 0 ]; then > echo "($ST - $ET)" > echo > fi > done kex_exchange_identification: Connection closed by remote host Connection closed by 217.197.84.140 port 22 (Tue 29 Jul 10:30:58 UTC 2025 - Tue 29 Jul 10:31:06 UTC 2025) farfalle$ ```
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This might be related with: Fix: https://code.forgejo.org/infrastructure/k8s-cluster/pulls/413/files

This might be related with: Fix: https://code.forgejo.org/infrastructure/k8s-cluster/pulls/413/files

I was using codeberg quite heavily today and did not encounter the problem again. Closing ticket ...

I was using codeberg quite heavily today and did not encounter the problem again. Closing ticket ...

Nope, earlier today i had no problem but now, it take several minute (one took me 20m before a Broken Pipe) just to push (non lfs) / pull.

Nope, earlier today i had no problem but now, it take several minute (one took me 20m before a Broken Pipe) just to push (non lfs) / pull.
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Reduces accessibility and is thus a "bug" for certain user groups on Codeberg.
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