Infowar.Com Forums  
   Winn Schwartau's (author of "Information Warfare") forums for discussing information warfare, network security and legal hacking. Additional forums include hacking and programming tutorials and challenges.
   http://www.infowar.com/

SecurityForumX  
   Security forums devoted to discussing news items found in the related SecurityNewsPortal website. Discussion topics include viruses, firewalls and system exploits and weaknesses.
   http://www.infosyssec.com/forum/

Security Forums Dot Com  
   Offers support forums on a selection of IT security topics including firewalls, encryption and malicious software. Based in UK.
   http://www.security-forums.com/

SecurityRisk  
   Discussion forums on operating system, database and network security. Topics include security vulnerabilities, audit tools and white papers.
   http://www.securityrisk.org/

Open CSO Project  
   Focused on career development in the security industry. Forums cover management and leadership skills, appropriate technical expertise as well as resources helpful to security professionals.
   http://www.opencsoproject.org

Wilders Security Forums  
   Security forums covering a wide array of topics including spyware, viruses and privacy software.
   http://www.wilderssecurity.com/

Castle Cops  
   Discussion forums. Subforums include firewalls, homeland security and specific security vendor products. Also offer software reviews and downloads.
   http://castlecops.com/