7. Click below 'Review and launch' to continue. Here you can review your choices. We will be changing some settings in 'Security groups' to allow for port 3338 and a custom port for remote desktop (optional). Setting a custom port for remote desktop will require changing the registry in windows but we will show you how to do this later. For now we will keep the default RDP port OPEN, and add three more ports TCP 3338, UDP 123, and TCP 9833.