I've setup claim based security on my MVC app using the Identity and Access tool to authenticate to identity providers.
When I go to a page that needs an authenticated user, the user is redirected to the page where you can choose your identity provider. When clicking on an IP, the user seems to be authenticated, and returned to the returnURL. In Fiddler I can see that the claims are returning from the IP. But for some reason MVC does not report them and Thread.CurrentPrinciap.Identity.IsAuthenticated remains false and therefore the user is redirected to the authentication page again.
I now don't have any idea where to look anymore.