Integration

I am trying to make the simplest test into my brand new OSB environment: Publish a remote web service in the bus.

To acomplish this test i have followed these steps:

I have checked that the external web service is working and the WSDL is accesible from the OSB machine.
I have created a new session in the sbconsole and created a new project
I have imported the WSDL and called CursosFormacion.
I have created a new business service from WSDL Web Service and selected the Port available.
then i´ve activated the changes and try to test it using the debug console.

When i try to run the service i get a "Service Unavailable" error in the response (http-error-code: 503)
I have tried to increase response timeout but without success.

I have checked that the remote web service is working using SOAP UI 3.0 and the service is ok.
Can anybody tell me how to trace/debug this error?
Thanks in advance