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Re: ssh session times out annoyingly fast, why?

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On Wed, Sep 23, 2020 at 10:30:15AM +0300, Anssi Saari wrote:
> Britton Kerin <britton.kerin@gmail.com> writes:
> > I'm using ssh from a debian box to a rasberry pi (sorta debian also :).
> >
> > For some reason ssh sessions seem to time out pretty quickly.

How quickly, exactly?  What is the actual message/behavior you see when
it happens?  Are they both on the same LAN, or is there some complexity
in between them (especially a NAT router)?

> Well, the keepalives themselves can cause a disconnect if the keepalive
> messages are not reaching the other end due to bad connection for
> example. Looks like by default in Debian client sends keepalives if
> server is quiet but server doesn't send keepalives to a client.

The normal reason people need to use ServerAlive or ClientAlive is NAT.
If your connection from ssh client to ssh server goes through a NAT
router, the router may keep track of activity on that connection, and
drop the translation when it goes idle for 5 minutes or so.  Forcing the
*Alive packets to happen every few minutes prevents a NAT timeout.

If there is no NAT involved, then I agree with the previous suggestion
that this might be a shell's TMOUT variable.  Are you sitting at a shell
prompt when the "timeout" occurs?  Does the timeout stop occurring when
you're inside a text editor, for example?

Much more information is needed here.

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Thread

ssh session times out annoyingly fast, why? Britton Kerin <britton.kerin@gmail.com> - 2020-09-22 01:40 +0200
  Re: ssh session times out annoyingly fast, why? Joseph Loo <jloo20111002@gmail.com> - 2020-09-22 01:50 +0200
  Re: ssh session times out annoyingly fast, why? Toni Mas Soler <antomassol@gmail.com> - 2020-09-22 11:40 +0200
  Re: ssh session times out annoyingly fast, why? Gary Dale <gary@extremeground.com> - 2020-09-22 22:50 +0200
  Re: ssh session times out annoyingly fast, why? Anssi Saari <as@sci.fi> - 2020-09-23 21:50 +0200
    Re: ssh session times out annoyingly fast, why? Greg Wooledge <wooledg@eeg.ccf.org> - 2020-09-23 21:50 +0200
      Re: ssh session times out annoyingly fast, why? Britton Kerin <britton.kerin@gmail.com> - 2020-09-26 23:20 +0200
        Re: ssh session times out annoyingly fast, why? Greg Wooledge <wooledg@eeg.ccf.org> - 2020-09-28 14:10 +0200
      Re: ssh session times out annoyingly fast, why? Michael Stone <mstone@debian.org> - 2020-09-29 14:20 +0200
        Re: ssh session times out annoyingly fast, why? Gene Heskett <gheskett@shentel.net> - 2020-09-29 14:50 +0200
          Re: ssh session times out annoyingly fast, why? Michael Stone <mstone@debian.org> - 2020-09-29 15:00 +0200
            Re: ssh session times out annoyingly fast, why? Tom Dial <tddial@comcast.net> - 2020-09-30 05:00 +0200
        Re: ssh session times out annoyingly fast, why? <tomas@tuxteam.de> - 2020-09-29 16:30 +0200
          Re: ssh session times out annoyingly fast, why? tomas@tuxteam.de - 2020-09-29 16:40 +0200
            Re: ssh session times out annoyingly fast, why? Michael Stone <mstone@debian.org> - 2020-09-29 16:50 +0200
              Re: ssh session times out annoyingly fast, why? <tomas@tuxteam.de> - 2020-09-29 17:00 +0200
          Re: ssh session times out annoyingly fast, why? Michael Stone <mstone@debian.org> - 2020-09-29 16:50 +0200
            Re: ssh session times out annoyingly fast, why? Stefan Monnier <monnier@iro.umontreal.ca> - 2020-09-29 17:20 +0200
              Re: ssh session times out annoyingly fast, why? Michael Stone <mstone@debian.org> - 2020-09-29 17:30 +0200

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