I just upgraded from YouTrak 5.2 to YouTrack 6.0 (build 12463 - as shown in the screenshot below).
I had some trouble importing the data initially.. but now I can login and I am seeing the issues.. so data seems imported.
However during login I am getting user authentication is disabled... can't connect to Ring.. (see screenshot)..
What should I configure?.. right now none of the user can login.
Edit: Added service.log and youtrack-stdout.log