Linux (server) forum at Tek-Tips
   Technical support forums and mutual help system for computer professionals. Selling and recruiting forbidden.
   http://www.tek-tips.com/gthreadminder.cfm/lev2/3/lev3/20/pid/54

Linux Forums.org
   A place to ask and answer Linux questions.
   http://www.linuxforums.org

Linux Questions
   A free Linux forum where Linux newbies can ask questions and Linux experts can offer advice.
   http://www.linuxquestions.org/

Linux-User.com
   A discussion board for linux people.
   http://linux-user.com

Unix/Linux Forum
   Range of topics such as networking and TCP/IP, web and FTP servers, security issues and firewall problems.
   http://www.unixforum.co.uk/