Windows 7 redirecting LPT ports to Terminal Services is broken compaired to Vista and XP

Hello forum
We have encountered an issue with mapping LPT1 ports from any terminal server be it 2003 or 2008, the problem is the same.
Our XP clients and Vista clients works fine. Seems this issue is only present on Windows 7.
We have a program that requires printing to be done on the LPT1 port. The Printer connected to the client is driver less, it uses the raw output from the LPT port. So try not to think of it as a normal printer. We do not require drivers to be installed on
the server or client.
Our XP and Vista clients works perfectly by using: net use LPT1:
\\tsclient\lpt1:
And then printing to the LPT1 port.
When using Windows 7 clients to print, only 512 bytes are forwarded to the printer and the rest of the job is missing. If we print directly to
\\tsclient\lpt1: the print job is working and all is forwarded. But our program cannot print to UNC paths.
So what has changed in between Vista/XP and Windows 7 on the LPT port forwarding subject?
Our printer is a STAR TSP if you would like to know. The Win 7 Clients prints fine to the printer locally to the LPT port when not connected to the Terminal session.
Thanks for your time.

Hello Mobay,
Here are the conclusion about this situation:
Symptom:
The Win7 client could not re-direct LPT port to a local printer when connecting through a terminal server/remote desktop session.
Cause:
This is an known product issue of Win7, no QFE available yet.
Resolution:
Possible workaround with Windows XP SP3, RDP 6.1 (and Hotfix 972828).
Win7/Win2k8r2
Vista/Win2k8
WinXP/Win2k3
RDC 5.2
Succeed to redirect
RDC 6.1
Fail to redirect
Succeed to redirect
RDC 7.0
Fail to redirect
Fail to redirect
Succeed to redirect
So it's by design that you can't use LPT port through RDP on Win 7 client machine.
Best Regards
Darith Iv
Core System Analyst
Microsoft Product Services and Support

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