Probably it would be much easier for you to setup tailscale. Just install it on the system you host the other services, install on the other end and use the tailscale ip. It should require minimal effort to set up with the added benefit of not having ports open, and way easier maintaining.

As for wireguard, the allowed up section tells what ips should be routed through the tunnel, it's not that difficult, but hard to wrap your head around at first. A friend of mine also used to use the Fritzbox Implementation of wireguard and I remember you need to specifically setup what clients you want the tunnel to have access to.

Have a look at tailscale.

There’s not a lot of information to go on here, but my first thought is that you haven’t configured your VPN to route to the local network. So, while you may be getting a connection to the VPN server, your computer doesn’t know where to send traffic for Cockpit.

There is usually a way to push those routes to the client from your con server.

Would probably setup something like Pivpn on the server and port forward it

Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:

3 acronyms in this thread; the most compressed thread commented on today has 6 acronyms.

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