Informix On-Line error: "not trusted by server"

Whatever I do, I get the following error: 00:44:43 listener-thread: err = -956: Client host or user(informix@torserv2.econnect.ca) is not trusted by the server. Essentially, I want to do a logical log backup and create other dbspaces. The cause could be that non-exact (multiple names) machine name was provided when installing Informix. But is there a solution (to fake something to the Informix server) so that I can get the job done without re-installing everything all over again? Thanks a lot. Yudong