Basic level description of locking down your box.
"The very first step is to seal any ports you aren't deliberately using. Although Linux is secure by design, vulnerabilities are regularly discovered and it is only sensible to mitigate risk. It's a good idea to use nmap to check the services your computer is exposing. Check this over the Internet using your public IP address too." iTWire - Hardening Linux
(Submitted by Noel Mon Aug 13, 2007 )
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