This PowerShell Script allows you customizing your RDP default port and and replace it by some thing like 3399 or 33381.
Note : it's recommended to use/specify a higher port numer (eg : 33381).
You have to run this PS Script as Administator.
To change your RDP Port, just launch the script, specify the new port and click "Enter" :).
Please note that a reboot is required, so you have to plan this operation for your RDSH production Servers.