When you connect to a remote desktop and your printer does not appear we must first make sure that the drivers for your printer are on the server.
After that, if the operating system of server is Windows Server 2000 or 2003 should follow the steps below to resolve a known problem, because the server can not remap the ports directly for DOT4_USB or those connected to the network with the network adapter and TCP / IP protocol.
Click the Start button
click Run, type regedit and then click OK.

Locate and double-click on the following registry keys:
HKEY_CURRENT_USER
Software
Microsoft
Terminal Server Client
Default
AddIns
RDPDR select the key and choose New, then DWORD Value.
Type FilterQueueType and press ENTER (you must meet capitalization and leave no gaps)
Click Modify on the Edit menu.
Type ffffffff then click OK.
Close the registry editor and connect to Remote Desktop