Webservice authorization problem

I've implemented a simple web service in netweaver portal which requires authorization. The web service works fine when tested through Web service navigator and manually through running the web service client that I've implemented.

For everyday use the webservice client is implemented as a background task in workflow. The problem I'm having now is that the client gets "401 unauthorized" error when run as a background task. The user WF-BATCH is mapped in portal and has SAP_ALL in backend and administative rights in portal. Anything else that I should be aware of?

Edited by: Evan Cole on Mar 2, 2009 3:04 PM