Amazon AWS Cloud: Change RDP default port number in order to connect to Windows instance

While this doesn't make the security unbreakable, it is a good practice as default 3389 port is most often a target to be attacked.

Here are the steps to modify the default port and use another one:

1. Make sure the Security Group assigned to the Amazon instance has proper Inbound rule defined for the new port.

2. Set up Windows firewall to allow Inbound Traffic on the new port.

3. Change default port from registry:
- Start->Run-> regedit
- Go to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp\PortNumber
- Change default decimal value(3389) with the new port.


Please be careful when applying this kind of changes as you may end up without being able to access your machine at all.