Edit the Destination Server GPO.
- Open the gpedit.msc
- Expand the Computer Configuration >> Administrative Templates >> Windows Components >> Remote Desktop Services >> Remote Desktop Session Host >> Security
- Enable the "Require use of specific security layer for remote (RDP) connections" settings.
Note: For inmediate changes, If the GPO is edited by a global GPO, then you need to refresh the changes in the destination servers:
- Login to the server, Ctrl + R and enter "gpupdate".