Protocol error in Windows 7 RDP connection

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Sometimes when you try to start a Remote Desktop Session (RDP) from your Windows 7 computer you may end up with the following error:

“Because of a protocol error, this session will be disconnected. please try connecting to the remote computer again”

You may find that you can connect to this system from a Windows Vista or a Windows XP computer.


I haven’t seen a bug reported or assigned for this problem in Windows 7. But, a quick workaround would be rename the file c:\system32\mstscax.dll file on your Windows 7 computer and copy the file from a Windows Vista system.

If you do not have access to a Windows Vista PC, click here to download the file and upload to your PC (c:\windows\system32)

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I’ve tried this, but with no luck. I get an error message back that states the current Remote Desktop ActiveX Control (mstscax.dll) is not valid. Any other suggestions?

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