JDBC 603 Informix

Trying to set up a connection to an informix database but when I want to start up the connection I get the following error:

[ART.118.5042] Adapter Runtime (Connection): Unable to enable connection resource Default:Rebates.
[ART.118.5036] Adapter Runtime (Connection): Unable to configure connection manager.
[ADA.1.204] Cannot connect to the database with DataSource class “com.wm.dd.jdbcx.informix.InformixDataSource”.
[wm-cjdbc33-0009][Informix JDBC Driver]Server name must be provided.

I’m using IS 6.1 on a Unix Server with the JDBC Adapter version 6.0.3 connectiong to a INFORMIX 07.31 database.

Please Help