Installation and Upgrade Guides › Web Agent Installation Guide for IIS › Configure an SiteMinder Web Agent on an IIS 6.0 Web Server › How to Configure a SiteMinder Web Agent on IIS 6.0 › IIS 6.0 Web Agents and Third-Party Software on the Same Server

IIS 6.0 Web Agents and Third-Party Software on the Same Server

The IIS 6.0 Web Agent consists of an ISAPI filter and an ISAPI extension. The majority of Web Agent processing occurs in the extension.

When the Web Agent is installed on an IIS 6.0 Web Server with other third-party software, such as WebSphere or ServletExec, the Agent has the following restrictions:

• The Web Agent filter and Web Agent extension must be configured to run before other third-party filters installed on the web server.
• The Web Agent must be configured as the first wildcard application map if it is going to protect applications running as or spawned by an ISAPI extension.
• The IIS 6.0 web server does not enforce how third-party filters and extensions behave. IIS 6.0 processes ISAPI filters before calling ISAPI extensions, including the Web Agent extension. Therefore, the SiteMinder Web Agent for IIS 6.0 is unable to authenticate or authorize access to applications implemented as pure ISAPI filters. This limitation impacts Web Agent integration with other third-party offerings for the IIS 6.0 web server, if those offerings are implemented as ISAPI filters that process and/or redirect the request before ISAPI extensions are called.