To fully utilize Workgroup Manager Remote you need a Apple Macintosh running Mac OS X Leopard / Snow Leopard Server running Opendirectory. If you can connect via Server Preferences you can connect via Workgroup Manager Remote.
WHICH USER SHOULD I ENTER INTO WORKGROUP MANAGER REMOTE?
You should enter the local admin username and password into Workgroup Manager Remote. The Directory Administrator (diradmin) user seldom works.
WHICH PORTS DOES WORKGROUP MANAGER REMOTE USE TO ACCESS MY SERVER?
You need to be able to make a connection to port 311 on the corresponding server.
If you are sure, that all entries are correct, please try to connect to the server with Mobile Safari. Please browse to https://