@nzben QNAP TS-431 doesn't support container station, QNAP TS-431+ does. You should look for another platform to host the controller or use a hardware one.

@Pete625 NordVPN guide is petty comprehensive. You can do a cross-check with the TP-Link's guide here (use the OpenVPN section). There's also a troubleshooting guide here.

@engdevtest I saw the lhe logs but they are not very informative. You can double check your certificates. Probably the logs from the server side will be more helpful to you. There's a troubleshooting...

@RogueMan We've been through pretty much every possible reason for port-forwarding not working - here. What you can do is to bring up a simple web server on port 80 and test if that will work for you.

@engdevtest Try following this gude for configuring the OpenVPN client on your router.

@RogueMan There has to be something else that prevents the access to this port. I can confirm that Archer C5 v2 port-forwarding is working properly. Aside from that there's a newer FW release for...