Run the test below on your Linux device to verify that Port Forwarding has been enabled and the appropriate port is being forwarded.

• Ensure that your VPN is successfully connected, preferably using a PPTP or L2TP VPN connection, on the Linux device where you want to enable Port Forwarding.
• Install the ncat packages by running the following command in the Terminal: sudo apt-get install ncat.
• You will type the command ncat -l <remote port> in the Terminal after connecting to the VPN, setting up the necessary packages, and choosing the desired port.
• Then hit Enter. If there is no output after pressing enter, the test is complete:

• Complete the previous step, then go on to the next.
• On a different device not linked to your network (like, your phone using mobile data), open a browser.
• If the second device is not linked to a different network than the first, the test won’t work.
• Open a browser on the second device.
• Enter the URL: http://<VPN IP>:<Forwarded Port> 
• Enter to go on to the next steps.
• If you get the following output in the Terminal on the VPN-enabled device, Port Forwarding is active: