SSO from EP5/SP5 to SAP service Marketplace and SDN

Hi,

I am trying to setup single sign-on from our Enterprise Portal to the SAP Marketplace (service.sap.com) and SDN (sdn.sap.com). I managed to define a Data Source each which allows me to store the user credentials. Unfortunately when calling the iView (referencing these data sources) an automatic logon does not occur.

Anybody out there who can tell me what I am doing wrong.

Thanks, Wolfgang