LDAP group mapping in WordPress doesn’t work

I installed WordPress on a member server and tried to configure AuthLDAP. First I hoped, that the plugin would be configured automatically but it wasn’t. Anyway no problem. So I logged in with wp-admin and did my settings manually. Now I can log in with my LDAP user but don’t get a map for my groups. I think I tried every combination but no success. There’s no much information on the homepage of the plugin. Maybe someone here has a hint.

So, Problem gelöst. Entscheidend war, neben der Erkenntnis, dass beim Group-Mapping natürlich die gidNumber der entsprechenden LDAP-Gruppe eingetragen gehört, der Group-Filter. Hier gehört nur objectClass=posixGroup rein