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.