Advanced SSH security tips and tricks
In this article I'll show you some simple tricks to help you tighten security for your secure shell (SSH) service.
The SSH server configuration file is located in /etc/ssh/sshd_conf. You need to restart the SSH service after every change you make to that file in order for changes to take effect.
Change SSH listening port
By default, SSH listens for connections on port 22. Attackers use port scanner software to see whether hosts are running an SSH service. It's wise to change the SSH port to a number higher than 1024 because most port scanners (including nmap) by default don't scan high ports.
Open the /etc/ssh/sshd_config file and look for the line that says:
Port 22
Change the port number and restart the SSH service:
/etc/init.d/ssh restart
Allow only SSH protocol 2
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LoginGraceTime SSHD Setting
You may also want to set the LoginGraceTime on your SSH configuration.
See http://timarcher.com/?q=node/46