I am triggering a bp workflow using a Moss based infopath form. The authentication fails.

1. The user is added to the k2 process user rights under workspace.

2. The webservice itself has integrated security turned on

3. I can access the webservice over the browser 

4. I am using a client at the momment. Form services has been configured and will switch to it the momment i can submit my form and trigger the workflow.

 thanks.