Infowar.Com Forums (Popularity: )
http://www.infowar.com/ Winn Schwartau's (author of "Information Warfare") forums for discussing information warfare, network security and legal hacking. Additional forums include hacking ...
SecurityForumX (Popularity: )
http://www.infosyssec.com/forum/ Security forums devoted to discussing news items found in the related SecurityNewsPortal website. Discussion topics include viruses, firewalls and system ...
SecurityRisk (Popularity: )
http://www.securityrisk.org/ Discussion forums on operating system, database and network security. Topics include security vulnerabilities, audit tools and white papers.
Castle Cops (Popularity: )
http://castlecops.com/ Discussion forums. Subforums include firewalls, homeland security and specific security vendor products. Also offer software reviews and downloads.