SharePoint 2010 Search issue Internal server error exception. Troubleshoot issues Correlation ID

When you search in SharePoint 2010, you may get the following error:

Error

Internal server error exception

Troubleshoot issues with Microsoft SharePoint Foundation.

Correlation ID: de2996f1-a6c9-42fb-a6da-e5fc7d769069

Solution:

You will have to install the following hotfix

http://go.microsoft.com/fwlink/?LinkID=166231

For Windows Server 2008 R2, Hotfix for.NET Framework 3.5 SP1 that provides a method to support the token authentication without transport security or message encryption in WCF (http://go.microsoft.com/fwlink/?LinkID=166231).