The DBNETTYPE environment variable is used on certain machines to distinguish which network protocol to use when two protocols are available. The value that is currently set in it is not supported. Display the variable, and check that it is set correctly. Prior to Version 6.0, refer to the IBM Informix NET/Informix STAR Installation and Configuration Guide for the correct setting. If you are using IBM Informix OnLine for NetWare, set DBNETTYPE to starlan, tcp/ip, or some other supported network.