JSI Tip 5677. You cannot add an AppleTalk or DLC-based network print device from a Terminal Services session?

When you attempt to add an AppleTalk or DLC-based (Data Link Control) network print device from a Terminal Services session, you receive:

Source: Add Printer Wizard
Error : Specified port cannot be added. The request is not supported.

To workaround this feature, use the Add Printer wizard from the console of the server.