ldap users cannot login


this is my first experience with gw messenger. but unfortunately im facing an issue which i cant resolve. i dont have any existing ldap or edirectoy service installed on my network. in order to enable my existing gw users for gwmessemger i have to setup a ldap server of type groupwise. can someone assist me what ldap settings has been made so users can login. btw manually created messenger users can login. for the other users connection to server failed.