When you browse to an ASP.Net web application such as WebDocs Windows, the log-in page displays the error:
Server Application Unavailable
In the Event Viewer, there is an entry with an error message similar to the following:
Failed to execute request because the App-Domain could not be created. Error: 0x80131902


The IIS servers have corrupted the installation of the .NET runtime modules that are required to run ASP.Net web applications:
  1. Go to Start > Run.
  2. Type cmd and press Enter.
  3. Type the following commands and press Enter after each one:
    • cd C:\Windows\Microsoft.Net\Framework\v2.0.50727
    • net stop w3svc
    • aspnet_regiis.exe -ua
    • aspnet_regiis.exe -i
    • net start w3svc
  4. Refresh the web application page in your browser.

    The page now successfully displays.

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