ssh connection randomly times out

[Darren Tucker]

On Fri, 18 Sept 2026 at 15:12, James Moe via openssh-unix-dev
<openssh-unix-dev at mindrot.org> wrote:
> On 2026-09-18 12:41, Brian Candler wrote:
> >> 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?
>
> Idle time.

In that case it's very likely to be a timeout of a state table in a
firewall or NAT device.  You should see the increasing Send-Q I
described earlier, and setting ServerAlive* on the server, or
ClientAlive* on the server will likely mitigate it.

-- 
Darren Tucker (dtucker at dtucker.net)
GPG key 11EAA6FA / A86E 3E07 5B19 5880 E860  37F4 9357 ECEF 11EA A6FA
    Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.