Informix Problem - Please Help Urgently

Hello All I have been facing a strange problem with Informix Database server engine on Linux. Version of Informix Online Server - 5.10 UD1 Red Hat Linux 7.3 I could install and bring the engine online. The system has some Linux users who have different access privileges to some of the informix online databases. The problem I am facing is : When I change the password of any of the users, or if any of the users changes his password himself, the informix databases to which he had accees to before doing this, suddenly become inaccessible. He cannot even connect to the databases, and fire any queries to the database. I am not sure if this has anything to do with , synchronizing Linux and Informix access in some way, or making the users trusted-users etc. Any help in this regards would be greatly appreciated. You can contact me by e mail, if you need any further details on this problem.. Thanks in Advance Sincerely Rahul Gopal Joshi sending to informix-list