Got this Event on my SharePoint 2013 Front-End Web Server:

Event 8306, SharePoint Foundation 

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 SDK documentation and inspect the server trace logs..
When I've attempted to do an IISRESET it would fail, even though WWW Publishing Service was running.

Ended up removing IIS 6 Management Compatibility and re-enabling it with Server Manager, followed by a couple of reboots.  After that IIS would fire up and I can load my Sites again.