Hello Marek,
Congratulations!
>> Then i changed ldap server in "Manage Authentication" to my central openldap . I was under impression, that gluu should bind to my openldap, to check if user provided correct password, then check local DJ ldap for user attributes. From what i see, gluu after successful bind is looking for gluu attributes in this central openldap . Why is that happened ?
Take a look at [this](http://ox.gluu.org/doku.php? id=oxtrust:cache_refresh&s[]=cache&s[]=refresh) unofficial doc, does it make any sense? If not, please let us know what confusing you; we will improve the doc.
>> INFO | jvm 1 | 2015/11/03 00:25:14 | 2015-11-03 00:25:14,366 ERROR [org.gluu.oxtrust.action.Authenticator] Failed to find user 'tu7' in ldap
>> INFO | jvm 1 | 2015/11/03 00:25:14 |
Let's check if this user 'tu7' is available in Gluu's interal LDAP or not.