Hi Folks,
I had ADFS running in a 2016 server environment. I have upgraded the server to 2019, and now I get the above error message. There are no errors in the ADFS Event logs (other than the MSIS7065) and as far as I can see, everything
is configured correctly.
When I navigate to the idpinitiatedsignon.aspx page, this error is also displayed.
I can view the equivalent federationserverservice.asmx and xml pages fine and
EnableIdpInitiatedSignonPage : True
Does anyone have an idea on 1) what is meant by protocol handler and 2) a good way to diagnose the issue?
Regards.