SecurityForumX(site info)
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/
3.
Infowar.Com Forums(site info)
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/
4.
Open CSO Project(site info)
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