The same _symptoms_ are reproducible for UltraVNC 1 R 19 running as a service on a clean Win2KSP4 build. I didn't have the opportunity to cross-check other versions and I have no idea whether Ultra is forked from V3.3.x or 4, but here's what I saw.

+ same long hang, no shutdown for a couple of minutes.

+ I installed UPHClean (User Profile Hive Cleanup Service) - see this MSKB article:
http://support.microsoft.com/?id=837115
and the download from here:
http://download.microsoft.com/download/a/8/7/a87b3d05-cd04-4743-a23b-b16645e075ac/UPHClean-Setup.msi


After installation, shutdown was quick but UPHClean logged a forced key closure.

+ I ran UPHClean in reporting mode; you need to set the following DWORD value in the registry to 1 and restart the service:
HKLM\System\CurrentControlSet\Services\UPHClean\Parameters\REPORT_ONLY
(this info is in the readme:
http://download.microsoft.com/download/a/8/7/a87b3d05-cd04-4743-a23b-b16645e075ac/readme.txt
)


It identified the slow shutdown culprit as winvnc, locking the user's HKCU\Software\ORL key.

Mike Fedyk wrote:

I'm running Windows 2000 Professional SP4 with RealVNC 4 running as a
service.

When I shut down the PC, it logs off as expected and then for several
/minutes/ waits with the blue/green desktop colour before switching
off. During this delay, the logoff window has disappeared, leaving me
all alone but for a mouse pointer :-)

If I stop the VNC service, then shut down the PC it will power off in
under 30 seconds. Power back up, log on and then try to shut down
again, the several-minute delay happens again.

Can you reproduce this on another machine?

How old is this install of win2k?

How long has this happened?

Did it happen with VNC 3.3.7?

Does it happen when you log out and then shutdown?

Did you try updating your video drivers?
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