When starting a node, the port is accessible from 127.0.0.1 interface but not from the public ip

[snajjar]

When starting the relay with the following commands (like in the readme):

docker network create -d bridge cardano
docker run -it \
    --restart=unless-stopped \
    --network=cardano \
    --name main-relay1 \
    -p 3000:3000 \
    -p 12798:12798 \
    -e NODE_PORT="3000" \
    -e NODE_NAME="relay1" \
    -e NODE_TOPOLOGY="<IP-address of block-producing node>:3000/1" \
    -e NODE_RELAY="True" \
    -e CARDANO_NETWORK="main" \
    -e PROMETHEUS_PORT="12798" \
    -v $PWD/config/:/config/ \
    arradev/cardano-node:latest --start

the 3000 port is open from the 127.0.0.1 interface

sam@block:~$ nmap 127.0.0.1 -p 3000
Starting Nmap 7.80 ( https://nmap.org ) at 2020-09-28 10:37 UTC
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00013s latency).

PORT     STATE SERVICE
3000/tcp open  ppp

Nmap done: 1 IP address (1 host up) scanned in 0.04 seconds

but not from the outside (which make the registration step fail)

sam@block:~$ nmap <my-domain> -p 3000
Starting Nmap 7.80 ( https://nmap.org ) at 2020-09-28 10:39 UTC
Nmap scan report for <my-domain> (<my-ip>)
Host is up (0.000074s latency).

PORT     STATE  SERVICE
3000/tcp closed ppp

Nmap done: 1 IP address (1 host up) scanned in 0.04 seconds

The docker network part seems right (I tried to run a simple http server) with the following and it works:

 docker run --name python_simplehttpserver -d -v /home/foo:/var/www:ro -p 80:8080 trinitronx/python-simplehttpserver

I also checked if my public ip was correctly resolved by ./scripts/function/get_public_ip and yes, it's the case. Any idea of what may be wrong here?

[snajjar]

I also tried to run it with --net=host with no success. It seems that it's the cardano-node that is binded to localhost interface.

[abracadaniel]

Hi Snajjar,

Sorry for the slow response. I tend to forget to check the issues.

Make sure your HOST_ADDR environment variable is correct. It should match the IP of the node. Otherwise just set it to HOST_ADDR=0.0.0.0, then it will not depend on if you set it to the correct IP.

I'll update the examples to include it.