openssh unix dev - Oct 2010 - -R tunnels

After a connection issue, sometimes I get "Warning: remote port
forwarding failed for listen port" when trying to establish -R
tunnels, and that is because sshd didn't clear the port binding when
the connection droped.

Restarting sshd on the server *doesn't* clear this issue, the port
remains binded. ?Shouldn't a sshd restart solve this?
Also wouldn't it be reasonable to add a tunnel timeout option to sshd?

Regards,
Nuno



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Nuno Gon?alves wrote:
> After a connection issue, sometimes I get "Warning: remote port
> forwarding failed for listen port" when trying to establish -R
> tunnels, and that is because sshd didn't clear the port binding when
> the connection droped.
>
> Restarting sshd on the server *doesn't* clear this issue, the port
> remains binded.  Shouldn't a sshd restart solve this?
> Also wouldn't it be reasonable to add a tunnel timeout option to sshd?
>
> Regards,
> Nuno
The port at the server side is probably in TIME_WAIT. If you wait a few
minutes after the sshd restart, it should be solved. Bear in mind that it
may be the full problem and not disconnection detection. Also, a restart
is probably useless for closing ports forwardings since I think those
are done
after the fork and would thus be unaffected.