IBM Informix NET is searching for the database that is requested in the current statement. It is using the entries in the DBPATH environment variable and is trying one that, by use of //sitename, specifies a directory on another computer system. That system cannot be accessed.
Review the setting of the DBPATH environment variable. Check that any other systems it specifies have Informix STAR or IBM Informix NET installed and active. This message appears prior to Version 6.0.