Unable to RDP - Can't Connect to Remote Computer

 Issue:

  -Unable to RDP even port 3389 are open on both end to end Servers. You can Console the Server using domain/local account with no issue. But when you RDP you get this message.


and on the Server itself since you can console it when you rdp inside it you get this error message.



Action Done to Solve the issue:

Enable > ‘Require use of specific security layer for remote (RDP) connections’ 

Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > SecurityOn the right-hand side, locate the ‘Require use of specific security layer for remote (RDP) connections’ and double-click it to edit it.If it is set to ‘Not configured’, select Enabled and then in front of Security Layer, choose RDP.Click Apply and then hit OK.
then restart service

Note: My Server is a 2016 and possible Cause of it was because of update/patch.

Ref: 
https://docs.microsoft.com/en-us/answers/questions/300054/remote-desktop-connection-an-internal-error-has-oc.html

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