Now, you can change your AWS security group to completely close open access from the outside.
Confirm that direct SSH access to the AWS EC2 instance times out now:
C:\>ssh -i "Ubuntu-Virginia.pem" email@example.com
ssh: connect to host ec2-xx-xx-xx-xxx.compute-1.amazonaws.com port 22: Connection timed out
You've made your system invisible to the outside world, yet access using remote.it still works!