Help with 404 page error

Traefik Traefik v3 (latest)
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1

Hi,

I'm probably being stupid or it's something simple, but I digress.

I'm running Traefik v3.1 with Docker Compose as shown below:

services:
  traefik:
    image: traefik:v3.1
    container_name: traefik-test
    command:
      - "--api.insecure=true"
      - "--providers.docker=true"
      - "--entrypoints.web.address=:80"
    ports:
      - "80:80"
      - "8080:8080"
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
    networks:
      - web

  test_site:
    image: nginx:alpine
    container_name: test-site-traefik
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.test.rule=Host(`docker_testing.MYDOMAIN.co.uk`)"
      - "traefik.http.routers.test.entrypoints=web"
      - "traefik.http.routers.test.priority=10"
    networks:
      - web

networks:
  web:
    driver: bridge

The domain docker_testing.MYDOMAIN.co.uk correctly resolves to my VM’s IP.
Inside Traefik’s container, I can access the test container (e.g., using curl http://test_site:80) and get the expected Nginx page. However, externally, when I visit http://docker_testing.MYDOMAIN.co.uk, I receive a 404 error.
Traefik’s dashboard (http://<VM_IP>:8080) shows the router with the correct rule.

I'm not sure if it's relevant, but the DNS records for this VM and for the docker_testing.MYDOMAIN.co.uk are sitting on an internal Windows DNS server.

Any ideas on what might be causing the external 404? Thanks!

2

Not sure what you mean by "externally", as that should not work when using an "internal Windows DNS server".

Enable Traefik access log in JSON format (doc), to see if requests arrive at Traefik, if errors are only returned by Traefik (only DownstreamStatus) or already coming from target service (OriginStatus).