"Page cannot be found" when browsing aspx pages in Windows Server 2003 with IIS 6.0

  1. Start inetmgr.

  2. Expand the appropriate nodes in the IIS to locate the "Webservice Extensions" Node.

  3. Click on the same.

  4. You will find a list of "prohibited" extensions in the right.

  5. Click on ASP.NET and "allow" it.