Zend certified PHP/Magento developer

I am trying to connect RDP with AWS EC2 and every time this error occurs

5

This computer can’t connect to the remote computer. Try connecting again. If the problem continues, contact the owner of the remote computer or your network administrator.

I have done all the settings, enabled the remote connection from settings, allowed the remote desktop, and set my firewall, but this error is still coming everytime when I used to connect my EC2.
Can anyone help me with that