Bad Gateway with multiple networks

Traefik Traefik v3 (latest)
1

Hello,

i am runing the latest traefik as a docker container.
My whole setup is good working and everything works fine.
But now I try to attach two networks on a container. As soon as I add the second (not the proxy) network, I got a Bad Gateway when I browse the domain. When I remove it I directly god the success answer from the container.

Here are my configs:

docker-compose from Traefik:

services:
  traefik:
    image: traefik:v3.1
    ports:
      - 80:80
      - 443:443
    networks:
      - webproxy
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - letsencrypt:/letsencrypt
    command:
      - --api.dashboard=true
      - --log.level=DEBUG
      - --accesslog=true
      - --providers.docker.network=webproxy
      - --providers.docker.exposedByDefault=false
      - --entrypoints.web.address=:80
      - --entrypoints.web.http.redirections.entrypoint.to=websecure
      - --entryPoints.web.http.redirections.entrypoint.scheme=https
      - --entrypoints.websecure.address=:443
      - --entrypoints.websecure.asDefault=true
      - --entrypoints.websecure.http.tls.certresolver=myresolver
      - --certificatesresolvers.myresolver.acme.email=mail@mail.de
      - --certificatesresolvers.myresolver.acme.tlschallenge=true
      - --certificatesresolvers.myresolver.acme.storage=/letsencrypt/acme.json
    labels:
      - traefik.enable=true
      - traefik.http.routers.mydashboard.rule=Host(`traefik.domain.de`)
      - traefik.http.routers.mydashboard.service=api@internal
      - traefik.http.routers.mydashboard.middlewares=traefik-auth
      - traefik.http.middlewares.traefik-auth.basicauth.users=xxx"

Here is my docker-compose.yml of the container:

services:
   api-report:
        image: "ghcr.io/xxx/api-report:latest"
        container_name: api-report
        networks:
            - webproxy
            - loki
        env_file:
            - stack_report_api.env
        depends_on:
            talmap-db:
                condition: service_healthy
        labels:
             - "traefik.enable=true"
             - 'traefik.http.routers.api-report.rule=Host(`report.domain.de`) || Host(`www.report.domainde`)'           - "traefik.http.middlewares.mywwwredirect.redirectregex.replacement=https://$$1"
             - "traefik.http.services.api-report.loadbalancer.server.port=8001"

             - "traefik.docker.network=webproxy"  # Specify the network here"
        volumes:
            - "/etc/timezone:/etc/timezone:ro"
            - "/etc/localtime:/etc/localtime:ro"
        restart: always
networks:
  webproxy:
    external: true
  loki:
    external: true

The Problem is, when I add the "loki" to the network-section of the api-report I got bad Gateway when I remove it, all works.

The only entry I see in the Traefik-log:

traefik-1  | 104.28.62.24 - - [28/Oct/2024:11:48:28 +0000] "GET / HTTP/2.0" 502 11 "-" "-" 647 "api-report@docker" "http://172.18.0.8:8001" 0ms

In the other Logs is also no error entry.

I also tried to add

   - "traefik.docker.network=webproxy"  # Specify the network here"

But this also make no working state.
Some ideas?

EDIT:
Okay I have a little point which I found out:
My Application is bind to one specific ip (the "container-ip", in an .env file I set the ip to the "container-name".) When I change it to 0.0.0.0, all works.
Is this a proper way to do this?

2

An app within a container should usually listen internally to 0.0.0.0, so all IPs assigned to the container via Docker networks are used for listening.