Bug#243832: Debian Bug #243832: possible solution
> I did set KeepAlive to no in my .ssh/config
KeepAlive (now known as TCPKeepAlive) is a per-socket option that
enables the system-wide TCP keepalive timer (which defaults to 120 minutes).
You probably want "ServerAliveInterval 300" in ssh_config or
$HOME/.ssh/config. This will cause ssh to send an application-level
keepalive every 5 minutes if there's no other traffic, which will keep
the connection "fresh" in the firewall or NAT device's state table.
Darren Tucker (dtucker at zip.com.au)
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