Windows 2008 R2 remote control rejected

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Hello.

On one of my Windows 2008 R2 Remote Desktop servers, when I attempt to=20
remote control most users' sessions, the screen flickers and I just see=20
my desktop again. The user too sees a flicker. This seems to happen on=20
end-user PCs that are using newer Remote Desktop Connection clients. One =

of the user's PCs is running Windows XP on an unknown version of RDC and =

when someone logs in from that PC, I can remote control that session.

Also, if I log in to the server myself from a Windows 7 PC using its=20
built-in Remote Desktop Connection software, THEN I can remote control=20
all of the users' sessions, so it seems there's an issue with rdesktop.=20
I experienced it with v1.7 so recently upgraded to v1.8.2 and still=20
experience it.

I did also try to change the RDP compression algorithm on the server=20
(tried 'optimal network bandwidth' and 'balanced') and neither made a=20
difference.

Even more strangely, on another of my Windows 2008 R2 servers whose=20
users all connect with Windows 7 and up, I can remote control all of=20
their sessions just fine with rdesktop 1.7 (and 1.8.2.)

What other information would you need to help me troubleshoot this?

Sincerely,
Sean M. Pappalardo
Sr. Networks Engineer
Renegade Technologies
[email protected]
Office: (630) 631-6188
http://www.renegadetech.com

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