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I have the same firefox container in my setup. Have you tried running an IP check from the firefox container when it's connected to wg0? I usually just use "curl ifconfig.me" in the container console. Does it show an IP for your VPN? I'm just wondering if the connection is working for the container or if there is an issue somewhere.

Was there a particular reason you were thinking of using VPN for Plex? I have a similar setup to you. I use Cloudflare/Reverse Proxy for some external facing content (or content others want to access) but then use WG VPN for remote access to everything else. Either way, I followed the guide above and it works well. The benefit of the inbuilt WG in Unraid is the ability to auto start and not need the array running.

I did think that may have been the issue too. I was used to this when I had the containers running through another VPN container. But even when I attempt access by IP:Port, it still doesn't work. EDIT: I decided to use the WG tunnel from Unraid to connect to my home network instead. When I access this way, rather than through the tunnel from my router, I can access the WebGUI of the other tunneled containers.

Thanks so much for the post. This helped and got it working for me. The only issue I have noticed is the inability to access the webgui for a number of containers behind a docker tunnel, if I too am accessing remotely from another wireguard tunnel. I am not sure if it is something to do with routing or not? I confirmed that I can access the webgui of the containers if I am on the local network. The remote tunnel is run on my router rather than the unraid system, so I also don't know if that is causing me the issue or not. Any thoughts or suggestions?