If you are sure the remote computer is connected to the Internet but you see:
VNC Server is not currently listening for Cloud connections
...when attempting to connect, then it may be that the remote computer is asleep. Note that Wake-on-LAN (WOL) is not currently supported under any platform.
You cannot boot a remote computer that is turned off using our standard products. However, you can use VNC Viewer Plus to remotely power on and control certain Intel Core vPro computers.