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Foresight
Avoid Accidental Reboot  21 August 2006 
Security Tips On a production server that is in a common area (although this should not be the case, some situations are inevidable). To avoid an accidental CTRL-ALT-DEL reboot of the machine, do the following to remove the necessary lines from the /etc/inittab file:
# sed -i 's/ca::ctrlaltdel:/#ca::ctrlaltdel:/g' /etc/inittab

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Nmap  21 August 2006 
Security Tips Make use of security tools out there to test your server's weaknesses. Nmap is an excellent port scanning tool to test to see what ports you have open. On a remote machine, type the command:
# nmap -sTU

Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2006-08-10 13:51 EST
Interesting ports on eric (172.16.0.1):
(The 3131 ports scanned but not shown below are in state: closed)

   PORT    STATE         SERVICE
   22/tcp  open          ssh
   113/tcp open          auth
Nmap run completed -- 1 IP address (1 host up) scanned in 221.669 seconds

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Skill  21 August 2006 
Security Tips Users who may be acting up or aren't listening can still be controlled. Using a program called 'skill' (signal kill) which is part of the 'procps' package.
Halt/Stop User eric: skill -STOP -u eric
Continue User eric: skill -CONT -u eric
Kill and Logout User eric: skill -KILL -u eric
Kill and Logout All Users: skill -KILL -v /dev/pts/*

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