The RDP protocol component "DATA ENCRYPTION" detected an error in the protocol stream and has disconnected the client.
This is a known issue and can be resolved with a simple registry change. below is an image of a registry change made on a server. Unable to connect to the server using RDP, this registry change allowed the connection. The registry key is circled. Below the certificate entry in the right window pane, is the certificate entry that was originally there and was renamed - hence the double dash (--) in front of the name. The registry change was made and no reboot was required. Just tried connecting again from another server and the new certificate entry was entered automatically into the registry on the server.
The old and new entries in the registry to fix the RDP problem look the same but the data value does differ. The string is a long entry that's not shown in the image. All the way to the right the numbers/characters start to change.
This is a known issue:
Link to this port, add to favourites...