CRM 2013: Web.config error (HTTP 500.19) after installing .NET Framework 4.5

I had a vanilla installation of CRM 2013 running smoothly on Windows Server 2008 R2. I installed Visual Studio 2013, which adds .NET Framework 4.5. I then started getting the error below when browsing to CRM:

HTTP Error 500.19 – Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid.

The actual config error is:

The configuration section ‘system.web.extensions’ cannot be read because it is missing a section declaration

I fixed this with the steps below:

  1. Change the CRMAppPool in IIS to use .NET Framework 4.0
  2. Enable ASP.NET v4.0 for the server by:
    1. Clicking on the server name in IIS
    2. Click ISAPI and CGI Restrictions under the IIS section
    3. Allow ASP.NET v4.0 (x64)
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About Bernado

Based in Australia, I am a freelance SharePoint and Dynamics CRM developer. I love developing innovative solutions that address business and everyday problems. Feel free to contact me if you think I can help you with your SharePoint or CRM implementation.
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