Hi all,

I have 2 servers running CentOS 5.4 Final, one is 32 bit and the other is x86_64.
When I ssh to either server, the session will freeze after a while and I cannot type anything except I close the term. This has happened before, and I thought that was caused by iptables' rules.
But now I turned off iptables and the problem remains.

I tried tcpdump on my machine(client running OpenSUSE 11.2), and it shows that after the freezing, client will still sent ack message to the server.
So I think this may be caused by the server.
Note that I can ping the server smoothly.

Does anybody meet this problem before? How can I solve this problem?? Or is there any tip to dig out the problem?

Thanks in advance.

its not freezing.

the ssh session is timing out. configuration file is /etc/ssh_config

the parameter you are looking to set is ServerAliveInterval

I think you are right. After setting the ClientAliveInterval on the server and ServerAliveInterval on the client, the problem seems running away.
Also, the tip given in the FAQ of OpenSSH is helpful: http://www.openbsd.org/openssh/faq.html#2.12