@Abdelrazeq Only VR600 v1 had bandwidth control feature. VR600 V2 and v3 use QoS for prioritizing the traffic. - here's the guide. There's no indication that bandwisth control feature would be...

@djawz Archer AXE5400 can't be used to repeat/extend your landlord wireless connection, because it has only two working modes: Wireless Router mode Access Point mode For the purpose you want a...

@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.