Using Microsoft Dynamics 2013, today we had this quite informative error “Invalid Action – The selected action was not valid” which was preventing all users from logging in!
After confirming it wasn’t the ADFS server at fault checked the services on the CRM server checking the services found that the “Microsoft CRM Asynchronous Processing Service” had stopped.
Starting this then allowed all users to log back onto the CRM server again.
Big Nose Kates 