Wireguard.

Because I would like to self-host everything myself, so why should I use another 3rd party service?

did you bind one of them to any host? If not you can delete any of them, then use the other one.

You have to set the docker container name as the destination, not the host IP.

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Test everything from the beginning.

# check your FQDN is set up correctly.

$ nslookup 1.1.1.1

$ nslookup 8.8.8.8

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# Test your web host from out of the docker host.
$ curl -v http://your_fqdn

# test your web host on the host machine.
$ curl -v -H “Host: your_fqdn” http://localhost
# check if your port is exposed if you map it.

docker ps | grep

# check if your mapped port is listening on the docker host
netstat -tlnp | grep

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#check if your container is reachable by NPM.

docker exec -it bash

[root@docker-278f29455e29:/app]# apt update && apt install netcat

[root@docker-278f29455e29:/app]# nc -zv

if NPM reaches docker, you’re OK.

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There are many things you have to check more, for example, NPM and your destination container should be in the same docker network.

# docker inspect | grep NetworkID
# docker inspect | grep NetworkID

They should be equal.

etc. etc.

NPM + Authelia.

Graylog

Proxmox + docker host.