DNS records need to point at LAN IP of the reverse proxy.

If proxy and destination are both running as containers on the same host, then place them together in the same Docker network and use the container name of the destination as hostname, and use the internal port of the service, not the port you might have mapped to the host.

Why not make this a lot easier and share exact details? NPM settings, Docker compose files, log output?

Btw /r/NginxProxyManager exists for this.

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.