I had the following problem, and I found the solution:
Had Windows Server 2003 running. Installed SP1. Lost RDP connectivity with
the error message "You do not have the proper encryption level to access this
Session" being returned to the client.
Solution:
It seems that SP1 didn't properly handle the existing connection that was
configured under Terminal Services Configurations (tscc.msc /s). I ended up
deleting the RDP connection and re-creating it.
Before doing this, I found a post that said I should set the following
registry key:
HKLM/System/CurrentControlSet/Control/Terminal
SErver/WinStations/RDP-TCP/MinEncryptionLevel
to 0. I did this with no effect. I also set MaxConnectionTime from
5265c00 hex (86400000 decimal) to c00 hex. I just guessed at this c00 value
- I was trying to time-out any sessions that might be in effect (after all,
the message said "You do not have the proper encryption level TO ACCESS THIS
SESSION"). Of course, I rebooted between each change. After I got the new
connection working, these two key values were already cleared - no need to
reset them.
I hope this helps other people!
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