CRM XRM service including error information

Here is what you need to add to the web.config of the CRM website so that you can see why the XRM service maybe failing on a call:

<system.serviceModel>

    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" />

     <behaviors>

      <serviceBehaviors>

        <behavior>

          <serviceDebug includeExceptionDetailInFaults="true" />

        </behavior>

      </serviceBehaviors>

    </behaviors>

  </system.serviceModel>