Comments on: Secure shell (ssh) session timeout http://www.linuxscrew.com/2007/08/27/secure-shell-ssh-session-timeout/ Put the screw on Linux! Tue, 14 Oct 2008 07:54:06 +0000 http://wordpress.org/?v=2.2.2 By: artiomix http://www.linuxscrew.com/2007/08/27/secure-shell-ssh-session-timeout/#comment-140 artiomix Mon, 24 Sep 2007 08:07:35 +0000 http://www.linuxscrew.com/2007/08/27/secure-shell-ssh-session-timeout/#comment-140 Hi P.E., Here are some directives of SSH server's sshd_config that are related to session timeouts: ClientAliveInterval TCPKeepAlive KeepAlive Here are some directives of client's ssh_config: ServerAliveInterval TCPKeepAlive sshd_config and ssh_config are usually located at /etc/ssh directory of server and client. These directives are are widely described by <code>man sshd_config</code> and <code>man ssh_config</code> but default settings may be different from distro to distro. P.S. As for me, I found first tip of current post the most useful as it works brilliantly at every *nix machines I was working with via ssh (just make <code>ping 127.0.0.1</code> when you're going to leave ssh terminal untouched for some time). P.P.S. Another nice workaround is to use <code>screen</code> utility. In case you use it you can be sure that you won't loose any output of commands you've started. <a href="http://www.linuxscrew.com/2007/08/06/keep-ssh-session-saved-unix-screen-utility/">Here</a> is little notice how to use it. Good luck! Hi P.E.,

Here are some directives of SSH server’s sshd_config that are related to session timeouts:

ClientAliveInterval
TCPKeepAlive
KeepAlive

Here are some directives of client’s ssh_config:

ServerAliveInterval
TCPKeepAlive

sshd_config and ssh_config are usually located at /etc/ssh directory of server and client.

These directives are are widely described by man sshd_config and man ssh_config but default settings may be different from distro to distro.

P.S. As for me, I found first tip of current post the most useful as it works brilliantly at every *nix machines I was working with via ssh (just make ping 127.0.0.1 when you're going to leave ssh terminal untouched for some time).

P.P.S. Another nice workaround is to use screen utility. In case you use it you can be sure that you won't loose any output of commands you've started. Here is little notice how to use it.

Good luck!

]]> By: P.E. http://www.linuxscrew.com/2007/08/27/secure-shell-ssh-session-timeout/#comment-137 P.E. Mon, 24 Sep 2007 02:44:06 +0000 http://www.linuxscrew.com/2007/08/27/secure-shell-ssh-session-timeout/#comment-137 I've been trying to deal with the freezing of ssh sessions on a debian etch box (kernel:2.6.18-5-686) for a while and have not had much luck. Sessions freeze after just a few minutes of inactivity - even if I am sitting in pine. echo "7200" > /proc/sys/net/ipv4/tcp_keepalive_time did not make any difference. Actually, 7200 was already stored in that file. This is a new problem which I did not have before upgrading from Mandrake 10 to Debian. Under Mandrake, idle sessions would get logged off (as opposed to frozen) after a reasonable interval. Can you suggest other things that I could try? Thanks! P.E. I've been trying to deal with the freezing of ssh sessions on a debian etch box (kernel:2.6.18-5-686) for a while and have not had much luck.

Sessions freeze after just a few minutes of inactivity - even if I am sitting in pine.

echo "7200" > /proc/sys/net/ipv4/tcp_keepalive_time
did not make any difference. Actually, 7200 was already stored in that file.

This is a new problem which I did not have before upgrading from Mandrake 10 to Debian.
Under Mandrake, idle sessions would get logged off (as opposed to frozen) after a reasonable interval.

Can you suggest other things that I could try?

Thanks!

P.E.

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