Re: Another ssh problem - it looks up after a couple of minutes.
From: Laurent Blume (laurent=//=pas_de_pub/news200505_at_elanor.org)
Date: 08/28/05
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Date: Sun, 28 Aug 2005 16:38:01 +0200
Dave wrote:
> I have a Sun Ultra 80 running Solaris 9 and ssh version (Sun_SSH_1.0)
> which is based on some variant of OpenSSH.
>
> Whenever I connect to another machine that has ssh running (including
> other Suns with other non-OpenSSH based servers), the connection locks
> up after a minute or two if not used. If its used, it keeps working.
>
> Any ideas what might be causing it to lock up if not used for a couple
> of minutes?
I never saw that behaviour, on lots of Sun and non-Sun systems. Which doesn't
help much, I know.
I have an SSH.com server not seeing correctly the idleness of the client.
> What I've tried/considered
>
> 1) I can't see any timeouts mentioned, other than
>
> LoginGraceTime 600
That shouldn't matter at all.
> in the sshd_config file of either machine.
>
> 2) KeepAlive yes
> is set in the /etc/ssh/ssh_config file
> (I'm not sure if that an OpenSSH command or not, but it is available on
> Suns).
It's an SSH protocol value, as far as I know.
> 3) I normally use tcsh, but have set up an accounts at both ends with
> /usr/local/bin/bash, and it still locks up.
Shouldn't matter.
> 4) I do allow direct root logins on one machine (yes I know it has its
> security risks) and it happens if logging in as root (/bin/sh, which is
> not the same as bash on a Sun) or as a normal user with /bin/tcsh
Sidenote:
It's not as risky as allowing telnet root, and not for the same reasons anyway.
It's only for the lack of accountability.
But it should not matter.
> 5) The local host has a firewall in the ADSL modem/router, but the
> timeout has been set >> than the time before the thing locks up.
>
> In one case, where a machine is on my local subnet, there is no firewall
> on that. In the other case, when I connect to my employers network,
> there is a firewall, but I have no idea how it is configured. But I had
> the problem long before there was any firewall there.
A firewall problem would be my first guess too. Is it possible for you to
activate logging of dropped packets on port 22?
I have seen a box with a firewall problem, that was resetting connections after
a while.
Also, snooping the connection on both sides to see where it hangs, and what is
the last packet sent.
Aaahh, something I've seen also, but a few years ago: the ISP was doing NAT, and
my public apparent IP address was changing after some time of inactivity. But it
was not as short as one minute.
> I've just thought of trying to run an X terminal on the remote machine,
> putting that into the background, and having a loop the prints the date
> every minute. I've not tried that one, but that is at best a poor hack
> even if it does work.
I'd advise first to use the screen command, available on the Companion CD or
other sources. You can configure it with a status line which does some traffic,
and even if the connection is lost, your session can be resumed at the same point.
Laurent
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