NewsForge: 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.

“IX. Thou shalt know the openings into your
servers…”

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