The Wyse S10 WinTerm (thin clients) are running an old version of Windows embedded, and so an old version of RDS. I'm thinking this is the crux of the issue. The exact error on the WinTerm is:
"Remote Desktop Disconnected
Because of a security error, the client could not connect to the remote computer. Verify that you are logged on to the network, then try connecting again."
PC's have no problem connecting. I found this TechNet article (http://social.technet.microsoft.com/Forums/windowsserver/en-US/e172f4c6-dbd1-4aa1-b6d7-ffff06b40a17/...) about the X509 Certificate registry keys, but I can't reboot the TS machines until after hours tonight. Plus, I was not able to get web activation to work, so I had to call in to MS. I'm hoping there is maybe a security settings I can "loosen' to allow these WinTerms to connect.
We have about 30 or so WinTerms that will be DOA tomorrow morning if I can't fix this today. Help greatly appreciated!