Bug#1087627: openssh-client: Session dies (quickly)

On Sat, Nov 16, 2024 at 01:25:11PM +0000, Helge Kreutzmann wrote:
> I'm using ssh a lot, usually having several ssh connections open the
> entire day.
> 
> About a week ago the connections started to terminate quickly, i.e.
> after a few minutes (I can time this, if this is of any importance).
> So I return to the ssh client, and on the first key I hit, the session
> is terminated and I get a message like:
> 
> Connection to 142.132.201.35 closed.
> client_loop: send disconnect: Broken pipe
> 
> The (very) bad thing is that the session is not closed ordinarily,
> e.g. bash_history does not contain the last commands (fortunately I
> did not have any other data loss so far).
> 
> If I work in the ssh session, the the dying is delayed, so it seems
> like the sssion dies after a certain inactivity time.
> 
> But this is very annoying, I'm in the middle of some work, read a man
> page or a web page just to find out, that the session died, I have to
> login again, cd to the correct directory etc.
> 
> The ssh target configuration is unchanged (running Debian stable) as
> well.
> 
> If you need any further information, I'm glad to provide it.

I think this is quite likely to be a network-level problem rather than
anything to do with OpenSSH.  But perhaps running with at least `ssh -v`
(or `ssh -vvv` if the extra output isn't too annoying) would at least
get a bit more information.