SharePoint 2010 farm hosting multiple web apps using claims authentication. Each web app has multiple zones.
After a code deployment we were unable to access the Intranet zone (NTLM Authentication) for all claims-based we apps in the environment.
The following is the error that was encountered when trying to access the sites in IE.
The following is the error that was being captured in the Application event log.
Log Name: Application
Source: Microsoft-SharePoint Products-SharePoint Foundation
Date: 10/11/2011 8:37:04 PM
Event ID: 8306
Task Category: Claims Authentication
An exception occurred when trying to issue security token: The server was unable to process the request due to an internal error. For more information about the error, either turn on IncludeExceptionDetailInFaults (either from ServiceBehaviorAttribute or from the <serviceDebug> configuration behavior) on the server in order to send the exception information back to the client, or turn on tracing as per the Microsoft .NET Framework 3.0 SDK documentation and inspect the server trace logs.
The following three services were in a stopped state. Once these services were started the sites started responding normally.