Changing port hangs sshd

[Wolfgang S. Rupprecht]

Andy Green <andy at warmcat.com> writes:
> Mauriat Miranda wrote:
>
>> Does anybody have any idea or hints? Seen something like this before?
>> Am I missing something critical (obvious)?
>
> A customer had a similar problem.  It was caused by a firewall / router
> box (sorry, forgot which) at his end killing the connection because of
> its own (stupid) idea that the connection was idle for too long.

I've seen this even for cheap NAT boxes that time-out the NAT mapping
after 10 minutes or so of not seeing a packet.  Adding the following to 
/etc/ssh/sshd_config fixed that problem, along with cleaning up any
idle connections that are related to a machine just dropping off the
net without first exiting sshd.

      ClientAliveInterval  60
      ClientAliveCountMax  30

-wolfggang
-- 
Wolfgang S. Rupprecht                http://www.wsrcc.com/wolfgang/
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