SSH non standard port connection closed by remote host

Traefik Traefik v2 (latest)
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1

I found an example on how to setup ssh behind traefik and it works fine if I leave it on port 22, when I try to change the port to another port I can no longer connect. Can someone have a peak at my file and see if I have missed something.

22:22
ssh -T git@localhost -p 22
git@localhost: Permission denied (publickey).

2224:22
ssh -T git@localhost -p 2224
ssh_exchange_identification: Connection closed by remote host

version: "3"

services:
  edge:
    image: traefik:v2.1.3
    command:
      - --providers.docker
      - --entrypoints.http.address=:80
      - --entrypoints.ssh.address=:**2224**
      - --api
    ports:
      - "80:80"
      - "8080:8080"
      - "**2224**:22"
    labels:
      - "traefik.enable=false"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"

  gitea:
    image: gitea/gitea:1.9
    environment:
      - USER_UID=1000
      - USER_GID=1000
    restart: unless-stopped
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.gitea-web.rule=Host(`localhost`)"
      - "traefik.http.routers.gitea-web.entrypoints=http"
      - "traefik.http.routers.gitea-web.service=gitea-web-svc"
      - "traefik.http.services.gitea-web-svc.loadbalancer.server.port=3000"
      - "traefik.tcp.routers.gitea-ssh.rule=HostSNI(`*`)"
      - "traefik.tcp.routers.gitea-ssh.entrypoints=ssh"
      - "traefik.tcp.routers.gitea-ssh.service=gitea-ssh-svc"
      - "traefik.tcp.services.gitea-ssh-svc.loadbalancer.server.port=22"
1 Like
2

I am also running into this issue. Other TCP entrypoints work fine, but SSH seems to choke. I am actualy getting ssh_exchange_identification: Connection closed by remote host. The issue has been localized to traefik as I am able to SSH into my container w/ port forwarding. The entrypoints are created, it shows the destination service, and there is no further relevant output.

Things I have tried:

  • (Docker) run with -p and connect with `ssh user@localhost -p 2222" (works)
  • (Kubernetes) port-forward into the container, same as above (works)
  • (Kubernetes) port-forward through the service (as a sanity check, works)
  • ssh through the load balancer on an external domain (via traefik, does NOT work)
  • port-forward directly to traefik container on pod entrypoint port (does NOT work)

The same ssh_exchange_identification is yielded in both failure cases.

EDIT: Attempting to curl the traefik container's entrypoint port yields 404 page not found. Relevant post: TCP Route not working

3

Update: I'm working around this issue by using nginx ingress. AMQP with TLS passthrough works with traefik, SSH does not...