Most all Allonis myServer 6 systems use TeamViewer software to allow Allonis to remotely connect to the system via the Internet.
Certainly the system has to be exposed to the Internet for our remote assistance.
No External website URL is required to be setup.
Here are details on what ports TeamViewer uses for Corporate networks.
Most all networks have no issue for TeamViewer to work.
Reset TeamViewer licensing (not to be used):
sudo teamviewer daemon stop
sudo rm /opt/teamviewer/config/global.conf
sudo teamviewer daemon start