Hi, Like the other similar threads, we went from 2.2.7 to 2.3.1 (and now 2.3.3) and are having the MainObject issue regarding the customer.pl frontend. One of the respondents said the 2.3.x LDAP configuration is slightly different but I've been staring and comparing the Defaults.pm and our Config.pm but haven't noticed anything. I copied the LDAP portion from the Defaults.pm and changed the connection settings to match our LDAP as someone mentioned that fixed the error for them but even using that didn't change anything. Even with the MainObject error, OTRS is authenticating and creating a customer session. It even looks like the customeruser portion of the Config.pm is being properly used as the session in Session Management shows the mappings (like UserLastname, UserFirstname). If nothing else works, I'll probably go with swapping the AuthSession.pm file from the 2.2.7 release. I'm just a little leery of mixing files from the different versions. I was hoping someone who changed their LDAP setting in Config.pm might be able to say what is different between 2.2.x and 2.3.x so I can look out for that. Thanks! Terrill