Benny,
Did you ever get a chance to look into this? I am trying the same thing via SAP NetWeaver Developer Studio's SAP Management Console Perspective and am encountering the same issue. None of the username/password combinations we have configured for NetWeaver seem to work. Does anybody at least know which user is expected here (ie, is it one of the user with "adm" in the name? Administrator?)?
Regards,
Kevin