Upon opening the WIN-911 Workspace you see the following error:

  • HTTP Error 500.0 - Internal Server Error

    Calling LoadLibraryEx on ISAPI filter "C:\Windows\Microsoft.NET\Framework\v4.0.30319\\aspnet_filter.dll" failed


IIS is incorrectly trying to load the 32-bit version of the ISAPI filter instead of the 64-bit version of the component.


Modify ISAPI filter mappings for ASP.NET 4.0 to point to the 64-bit version of aspnet_filter.dll.

    1. Open the Internet Information Services (IIS) Manager

    2. Select Default Web Site

    3. In the center pane, double-click ISAPI Filters


    4. Notice the ASP.NET_4.0 entries. There may be three ASP.NET 4.0 entries:

  • ASP.Net_4.0
  • ASP.Net_4.0_32bit
  • ASP.Net_4.0_64bit

    5. Double-click the generic ASP.Net_4.0 entry and set the executable path to C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_filter.dll. 

   6. Your system is now configured to use the 64-bit version and the error will not longer appear. 

Technical support

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