This is my fourth try to update from 5.2.4 to 6.
After enabling the root account manually and disabling LDAP because that failed after update I'm getting now this exception:
04 Nov 2014 21:07:54,691 ERROR [faultExceptionMapper] [qtp1581218723-50 ]  Exception while processing rest request
And again no login is possible :-(
Any ideas before I give up with Youtrack?