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HTTP Error 500.21 - Internal Server Error

This error occurs for various reasons. Below are various instructions that may solve this error:
  1. Refer to these instructions to ensure that all IIS options are installed.
    • While you're checking to make sure IIS options are installed correctly, you can uncheck the boxes, recheck, and restart to reinstall them.

  2. ASP.NET may be installed incorrectly. Open 'Run' and enter:
    • For 32bit systems - %windir%\Microsoft.NET\Framework\v4.0.21006\aspnet_regiis.exe –i
    • For 64bit systems - %windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe –i
    • Then run 'iisreset' to make the changes.

  3. Repair your .NET framework. Open 'Run' and enter:
    • For 32bit systems - %windir%\Microsoft.NET\Framework\v4.0.30319\SetupCache\Client\setup.exe /repair /x86 /x64 /ia64 /parameterfolder Client /q /norestart
    • For 64bit systems - %windir%\Microsoft.NET\Framework64\v4.0.30319\SetupCache\Client\setup.exe /repair /x86 /x64 /ia64 /parameterfolder Client /q /norestart
    • Then run 'iisreset' to make the changes.

  4. Change the 'DefaultAppPool' in IIS from 'Classic Mode' to 'Integrated Mode':
    1. Open 'Run' and enter 'inetmgr'.
    2. Then navigate to view your 'Application Pools'

    3. Right-click on 'DefaultAppPool', select 'Basic Settings'.

    4. Use the drop down menu under 'Managed pipeline mode:' and select 'Integrated'

    5. Uninstall .NET Framework completely and then reinstall .NET Framework 4.0 (before reinstalling .NET Framework 4.5). You can get .NET Framework 4.0 from here.

Related Pages
Installing IIS
Installing the Software
Windows 2008 HTTP Error 404.3 - Not Found
HTTP Error 500.19
Error 401.2 - Unauthorized
Failed to Access IIS Metabase

Article ID:
Views: 1507
Created By: aaron
Modified By: admin
Created Date: 10/30/2014 9:16 PM
Last Modified: 3/1/2016 7:35 PM
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