I have set the proper LDAP configuration in Sonar 5.6.6 LTS (ldap plugin v2.2.0.608) and I see in logs that the connection is established.
When I first try to login with my LDAP-login, I am able to do so, but my user has of course no permissions - that is okay.
The problem occurs, when I want to first add my user and give him i.e. sonar-administrators group. When it is set and I try to login, Sonar authenticates me not against the external system (LDAP) but uses his own data base.
I am sure it worked with Sonar 4.5 but now I cannot configure it properly.