Remote Desktop Protocol Error between XP pro PC and NT Server 4.0

Hi all.

I just upgraded  windows XP professional to Service pack 3
After doing this users who use Remote Desktop to access a Windows NT 4.0 server are now having difficulty
they get a popup error stating
"Because of  a protocol error, this session will be disconnected. Please try connecting to the remote computer again"
Users who are still running XP Pro with service pack 2 are not getting this error'

So i am thinking it is related to an upgrade to a remote desktop protocol

I am about ready to pull my hair out

Any help would be greatly appreciated

cdubbciscoAsked:
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micalkinCommented:
according to the help on RDP:

To change authentication options, open Remote Desktop Connection, click Options, and then click the Advanced tab. If you're not sure which option to choose, ask your system administrator or the owner of the remote computer.

Remote computers that are running Windows Server 2003 with Service Pack 1 (SP1) or earlier operating systems cannot provide their identity for verification. If you know that the remote computer is running one of those operating systems, you can avoid authentication warnings by choosing Always connect, even if authentication fails, and then saving that change by clicking Save or Save As on the General tab.

The default option is "Always connect, even if authentication fails." To change it for future use, select the authentication level you want, and then, on the General tab, click Save or Save As to save your settings to an .rdp file. To connect to the same remote computer in the future, double-click the .rdp file.
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cdubbciscoAuthor Commented:
i ended up just uninstalling service pack 3 and that fixed the error
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asavenerCommented:
I realize this is an old thread, but :

Find an XP SP2 machine.

Copy MSTSC.exe and related DLL (mstsc??.dll, I forget the exact name) from c:\windows\system32\ to a network location.

Then run that executable from the XP SP3 machine when connecting to the NT 4 terminal server.
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