We access two of our terminal servers using a public address and port 3389. Some hackers were trying to get in using that route. One suggestion I received is to change the port. I've read how to change it via registry - so I know to back up registry, change setting and reboot. I also know what the user has to do to modify how they come in (add :xxxx to the IP address).
How do I choose a port? I have a list of common ports. Do I just pick any port that's not on that list (up to 65535)?
Is there a better way to do this. We use ASA5505.