ssh connection randomly times out

[Brian Candler]

On 18/09/2026 19:12, James Moe via openssh-unix-dev wrote:
> opensuse tumbleweed
> OpenSSH_10.5p1, OpenSSL 3.5.3 16 Sep 2025
> linux 7.2.5-1-default x86_64
>
> I establish a connection to a remote host. After some random length of time
> (minutes, hours), the connection becomes unresponsive.

Idle time, or active time?


>   After a further period
> the connection is terminated:
>
> --[ termination text ]--
> Read from remote host sma-station12l: Connection timed out
> Connection to sma-station12l closed.
> client_loop: send disconnect: Broken pipe
> --[ end ]--
>
> This is a recent change. It would seem a timer has gotten involved in some way.
> Previously the connection stayed active forever. Obviously something changed.
> How do I diagnose the issue?

It's possible that something else has changed along the network path 
which is interfering with the session, so could you first demonstrate 
that the problem *doesn't* happen with an earlier version of OpenSSH? 
What's the most recent release which is problem-free? Or if you're 
really keen, do a git bisect to find the specific change (but I realise 
this is tricky when the problem takes a long time to rear its head).