When accessing an AWS environment, you can RDP using the environment details provided on the Web Gateway page. For older instances you will see it look like the following:

You'll notice at the bottom, the Developer Machine Name. This is the link to connect to your AWS environment through RDP. The older environments, like this one, just list the RDP link.
For newer environments, you will see it look like the following:

Notice that for the newer environments, the environment RDP link also includes the port number after it, 3391. This is because we have changed the RDP port number to 3391 to help with subverting hacking attempts. If your environment includes the port number, please use this new one. If it does not, please use the default RDP port. KB441918