error 951

Hi We are using informix 7.30 in a HP-UX box. one morning when i tried to connect to a database through dbaccess, i am getting the following error. (the machine was converted into trusted server the previous day) nformix@obelix:/usr/informix> finderr 951 -951 User username is not known on the database server. The database server that you tried to access does not accept either your user ID, the login name that is specified for the desired server host in your ~/.netrc file, or the user name that is specified in the USER clause of a CONNECT statement. If you are explicitly specifying your user name in the ~/.netrc file or in a CONNECT statement, check that the name is correct. If you do not have a valid user ID on the server computer, see your system administrator. This message appears with Version 6.0 and later. Can anybody tellme what i can do? Thanks and Regards, s'r'v'n'n