The following is a set of steps to help debug why a user can not connect to FBS application from a client workstation.
Server
Check that foundation is running on the server machine by connecting locally
Workstation
Check version of Java
Run javaws and go to About -> Help. The version should be at least Java 1.5.0_05. If it is not install the correct java version from User Setup for Accessing Business Suite.
Turn on the Java Console
Run javaws and go to Edit -> Preferences and select the Advanced tab. Expand the Java Control tree and select the Show Control radio button.
This will now start the Java Console when the Application is run.