for the authhash stuff in the v2 DNAS, user is always admin (though i'm starting to wonder if that should be changeable but that's me just waffling) and the password would be whatever has been set as the DNASr's adminpassword configuration option i.e. the master password for the DNAS. anything stream specific like that set for 'streamadminpassword' or 'password' or 'streampassword' will not work (and definitely not the last 2 ever as they are just for the source connection to the DNAS).
hope that makes some sort of sense.
-daz