Linux.com: Advanced SSH Security Tips and Tricks Apr 2, 2007, 07 :30 UTC (0 Talkback[s]) (9207 reads) (Other stories by Anže Vidmar)
"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..."