When trying to add a TeamCity server I get the following exception:
24 Jul 2012 12:13:09,839 ERROR [TeamcityRest ] [QuartzJobProcessor0 ]  Error creating a client for TeamCity REST
I using YouTrack 4.0.1. I did the same test on a 4.0 instance I have and it works fine (with the same TeamCity server).
Any ideas of what might be going on?