[ubuntu] openLDAP, gnome problems

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http://ubuntuforums.org – Hey community :) I try since 2 days to get an openLDAP server working and it works partly... but I run into a few problems and I hope some of you pro´s can help me with my problems. Just for information: I setup an openLDAP Server on Ubuntu 12.04 LTS with THIS tutorial. Everthing works as it should. I can connect via SSH (locally) without errors. I reboot the machine and the new name shows up on welcome screen (gnome) with the right name (added in LDAP). And here comes the problem: I enter the password for the newly added LDAP user the screen goes black for 3 seconds and then I´m back to (Hardware)