By default, Remote Desktop listens on port 3389. To make your connections more secure, you may want to change this default port to something else as below:
- Start Registry Editor.
- Locate and then click the following registry subkey:
- On the Edit menu, click Modify, and then click Decimal.
- Type the new port number, and then click OK.
- Quit Registry Editor.
- Restart the computer.
Note: Don't forget to add a new rule in windows firewall to accept connections on your new RDP port.
There are many other things you can do to secure your RDP connections but applying these 4 basic security steps will make it much more secure than a default configuration easily.
Hope this helps someone.