The Ninth Commandment of system administration
"For every network service you run, you've opened one more window on your server to the world. Firewalls are great for defending servers against attacks from the outside, but attacks don't always come from the outside. If you have a server inside your firewall hacked, the attacker can continue hacking away at other servers without worrying about the firewall stopping his progress. For this reason it is important to schedule network audits of all of your servers."
(Submitted by Noel Mon Jun 27, 2005 )
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