Port forwarding is only available if your router supports UPnP.
Your device scans for UPnP routers on the network.
If your device cannot locate the router, click Rescan. If the issue persists, click Diagnostics, and then verify your network configuration or contact QNAP support through Helpdesk.
The Add NAS Service window appears.
Auto: myQNAPcloud automatically selects an available external port.
Manual: You can specify a new port if the current service port is being used by other services.
If you are unsure about this setting, select TCP.
You can go to Overview to verify that there are no connectivity errors.