Setting Up WS Navigator 
You need to set up WS Navigator once to be able to test a Web service.
Go to the Technical Configuration tab.
Choose System Global Settings.
Choose the Access Information J2EE Server tab.
Choose Edit / Display.
Specify a host name and a port number.
If you are working with a J2EE engine with version 6.40 or 7.0, select J2EE engoine is 6.40/7.0.
Note that if this option is not selected, the system will assume that you are working with a J2EE engine with version 7.10 or later.
Save.