Print Ports and Drivers may not displayed on a computer that is running Windows 7

Consider the following scenario:

� You have a print server that is running Windows Server 2003,
� You try to print from a Windows 7 client to the print server

In this scenario, the print job may fail. When you check the Print Server Properties on the Windows 7 client, the Ports and Drivers are not displayed in the lists. Restarting the Print Spooler service alleviates the issue.

By default, Windows 7 will try to communicate to the print server by using the Asynchronous RPC protocol.  This protocol is not supported by Windows Server 2003-based print servers. 

To work around this issue, disable Asynchronous RPC on the Windows 7 client by adding the following registry entry:

HKLM\Software\Policies\Microsoft\Windows NT\Printers\EnabledProtocols
Type: DWORD
Data: 6

Windows 2008 and Windows 2008 R2 print servers supports all of the following protocols: Async RPC, Normal RPC, and SMB.  Windows 2003 Server only supports normal RPC and SMB.

Windows 7 clients may not be able to print to Windows Server 2003 print server
http://blogs.technet.com/b/tnforum/archive/2010/12/02/windows-7-clients-may-not-be-able-to-print-to-windows-server-2003-print-server.aspx

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