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RDPSSO / MSTSC - Remote Desktop cannot verify...

On launching a RDPSSO connection template the following message may appear:-

Remote Desktop cannot verify the identity of the computer you want to connect to. This problem can occur if:

The remote computer is running a version of Windows that is earlier than Windows Vista.
The remote computer is configured to support only the RDP security layer.
Contact your network administrator or the owner of the remote computer for assistance.Do you want to connect anyway?

Possible Solution
Create a new DWORD value named AuthenticationLevelOverride at \\HKCU\Software\Microsoft\Terminal Server Client\
Set the authentication level value to one of the following values:
0 - This value corresponds to No authentication.
1 - This value corresponds to Require authentication.
2 - This value corresponds to Attempt authentication.
To stop the message from appearing set the AuthenticationLevelOverride to '0' (zero).