I am using ASP.NET 5, In my solution I have Web API, Identity Server and Angular 2 project and I am authenticating Angular 2 client by using Identity Server, Angular 2 clien
I've gotten this error message for a couple of reasons.
One was solved with @leastprivilege answer.
Another was that my certs-files in my Identity Server project had been lost in Version control. So i just replaced the broken files with the originals and then it worked.