When running Federation Services on Web Agent Option Pack or CA Access Gateway (SPS), what are the possible causes and solutions when the following error message shows up in the FWStrace.log?
This usually leads the browser to receive error 500.
At first glance, this error is generic, and can mainly be caused by several reasons:
The Authnrequest is signed in a POST request:
Policy Server gets a problem retrieving the certificate for the assertion signature validation:
No Persistent realm nor Session Store enabled: