This article with the accompanying sample shows you how to create an IBM® WebSphere® Portlet Factory model that integrates with the IBM Websphere Process Server 6.0.1 applications. This article uses a web service deployed on Process Server. For integration with human tasks in business processes deployed on Process Server, see this page: Business Process Integration Extension for IBM WebSphere Portlet Factory.
Read the full article here: Integrating services from WebSphere Process Server
Download the sample from here: process_server_sample.zip
IBM - Integrating services from WebSphere Process Server
I checked with the team here, and they didn't think the sample required authentication so they're not sure why you'd see that error. If you have more detail, such as a stack trace, perhaps you could post it to one of the Portlet Factory forums.
I am trying to work with Portlet Factory/Process server Loan sample: getting an error...Authentication Failed for/UNAUTHENTICATED...