Traefik + Docker for Windows: Failed to create a client for docker, error: protocol not available & Provider connection error protocol not available

I'm having troubles getting a basic Traefik routing setup to work.

My goal is to get basic routing with two helloworld apps (each different to tell apart), both on port 80, e.g.:

• demo1.localhost -> helloworld1
• demo2.localhost -> helloworld2

Each of the images works fine if I run them via docker run in isolation.

Using Powershell from my project dir, /app, when I run docker-compose up I get the following:

The Traefik service launches, I can visit the dashboard just fine but the routing table doesn't show my routes. demo1 and demo2 launch just fine, but obviously I can't connect to them because the routing isn't working.

Even though the services all launch successfully - I repeatedly get the following errors:

traefik | ... "Failed to create a client for docker, error: protocol not available" providerName=docker
traefik | ... "Provider connection error protocol not available, retrying ..." providerName=docker

I've included my docker-compose.yml file below, which is the only file in my dir, /app.

docker-compose.yml:

# app/docker-compose.yml

version: '3.8'
networks:
  myweb:
    driver: nat

services:
  proxy:
    image: traefik:v2.3.0-rc4-windowsservercore-1809
    container_name: traefik
    ports:
      - "80:80"
      - "8080:8080"
    volumes:
      - source: '\\.\pipe\docker_engine'
        target: '\\.\pipe\docker_engine'
        type: npipe
    command:
      - "--api.insecure=true"
      - "--providers.docker"
      - "--providers.docker.exposedbydefault=false"
      - "--entrypoints.web.address=:80"
    networks:
      - myweb
    labels:
      - "traefik.http.routers.dashboard.rule=Host(`dash.localhost`)"
      - "traefik.docker.network=app_myweb"

  demo1:
    image: helloworld:1
    container_name: demo1
    labels:
      - "traefik.enable=true"
      - "traefik.docker.network=app_myweb"
      - "traefik.port=80"
      - "traefik.http.routers.demo1.rule=Host(`demo1.localhost`)"
# Have tried this below, doesn't help.
#    volumes:
#      - source: '\\.\pipe\docker_engine'
#        target: '\\.\pipe\docker_engine'
#        type: npipe
    networks:
      - myweb
    depends_on:
      - proxy

  demo2:
    image: helloworld:2
    container_name: demo2
    labels:
      - "traefik.enable=true"
      - "traefik.docker.network=app_myweb"
      - "traefik.port=80"
      - "traefik.http.routers.demo2.rule=Host(`demo2.localhost`)"
    networks:
      - myweb
    depends_on:
      - proxy

I saw a suggestion somewhere that I should enable the setting "Expose daemon on tcp://localhost:2375 without TLS" in Docker Desktop settings, which I have done but doesn't help.

My setup is:

• Docker Desktop (v19.03.12) for Windows
• Docker using Windows Containers
• Windows 10 (10.0.18363 Build 18363)

Question #1:

Anybody have any idea what might be causing the problem?

Question #2:

Notice in my file I also have a route set up for the dashboard, to route from dash.localhost to localhost:8080/dashboard, but even that doesn't work. Any idea how to get that working? Do I need to tell it to route from 80->8080 for the dashboard?