Cannot execute request from the current application pool

The specified request cannot be executed in the application pool that is configured for this resource on the Web server.

Please try the following:

Contact the Web site administrator if you believe you should be able to view this directory or page.

HTTP Error 403.18 - Forbidden: Cannot execute requested URL in the current application pool.
Internet Information Services (IIS)

Technical Information (for support personnel)

Go to Microsoft Product Support Services and perform a title search for the words HTTP and 403.
Open IIS Help, which is accessible in IIS Manager (inetmgr), and search for topics titled IIS 6.0 Architecture, Configuring Application Pools, and About Custom Error Messages.