If you use that address in NoMachine, you should be able to reach your server with an active VPN connection. Entering myname there for example will create a DDNS record of. On the port forwarding page, when you forward a port you can enter something in the DDNS field below it. The NoMachine connection comes in through the 'new' IP address of the VPS, which will be the AirVPN exit IP. The VPN connection closes, so that traffic coming in to Hetzner's IP will be routed out on Hetzner's IP again. In both cases, NoMachine disconnects and cannot reconnect, unless one of two things happen:

In the former case, if traffic from an AirVPN server comes back to you and you did not initiate the connection to the AirVPN server IP, your router drops the traffic – it doesn't know which of the devices in its network the traffic is meant for. This means that traffic coming in on Hetzner's IP will either be routed out through AirVPN's server or times out on the VPS entirely (because traffic must leave on the tunnel interface but is trying to get out on the physical one). When you connect to AirVPN with Eddie, all traffic is routed through the VPN. Oh, it's a remote desktop application, I see.

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