Abstract: A method and system for providing network security for Internet, intranet, and extranet networks using a common mechanism. The common network security system provides a common security mechanism for use when communicating via the Internet, intranet, or extranet. The common network security system provides a security module that can be shared by a web server that services the Internet and a web server that services an intranet. The Internet web server is shielded from the Internet via a site firewall and the security module is shielded from the Internet web server via a security firewall. The intranet web server is connected directly to the security module.