When you try to visit a Web page that is hosted on a computer that is running Internet Information Services (IIS) 7.0, you may receive the following error message:
Server Error in Application "application name" HTTP Error 404.2 – Not Found HRESULT: 0x800704ec Description of HRESULT: The page you are requesting cannot be served because of the ISAPI and CGI Restriction list settings on the Web server.
This issue occurs because the requested Internet Server API (ISAPI) resource or the requested Common Gateway Interface (CGI) resource is restricted on the computer that is running IIS 7.0.
To resolve this issue, configure the restriction on the ISAPI and CGI Restrictions page to allow the requested ISAPI resource or the requested CGI resource. To do this, follow these steps:
Click Start, type Inetmgr in the Start Search box, and then click Inetmgr in the Programs list.
If you are prompted for an administrator password or for confirmation, type the password, or click Continue.
Locate the level that you want to configure.
In Features view, double-click ISAPI and CGI Restrictions.
Right-click the restriction that restricts the requested ISAPI resource or the requested CGI resource, and then click Allow.