Yes use RID!!! So now test with PDC option, what your doing here is just to see if you can import the Users and Groups with entering the IP of the ADS server and the Admin and Password. IF that does not work something else is blocking it (Firewall, some type of virus protection bla bla bla.... but--->) can you directly connect the DSS V7 to the ADS on another empty NIC port? Using PDC can help trouble shot closer to the issue but not all the times.