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Windows/WSL2: Docker Desktop fails to publish container port 8000 #759
Description
Bug report
Description
Docker Desktop is not publishing a container's configured host port on Windows. The application works inside its container, but cannot be reached from Windows.
Environment
- Docker Desktop: 4.94.0 (241994)
- Docker Engine: 29.8.2
- Windows with WSL2 backend
- Docker context:
desktop-linux - Compose project: RealEstateAnalyzer
Expected behavior
The API container should publish port 8000 on 127.0.0.1, allowing Windows to reach:
http://127.0.0.1:8000/openapi.json
Actual behavior
The API serves /openapi.json successfully from inside the container (HTTP 200), but Windows cannot connect.
Docker inspect reports:
- HostConfig binding:
127.0.0.1:8000 - Runtime ports:
{"8000/tcp":[]} docker port realestate-analyzer-apireturns no mapping.- Windows
curl.exe http://127.0.0.1:8000/openapi.jsonfails with connection error. - No Windows TCP listener appears on port 8000.
Troubleshooting already attempted
- Restarted Docker Desktop.
- Re-ran
docker compose up -d api. - Force-recreated the API container.
- Tested publishing a port with a disposable container; host access also failed.
The issue persists after these steps.
Security/network context
The API is intentionally attached only to an isolated egress network and uses a proxy for outbound requests. Please help diagnose the Docker Desktop host-port publishing/forwarding failure without recommending that I attach the API to a less isolated network.
Diagnostics ID
1FDDCE98-8AE7-40FF-BFC9-599C36FA4922/20261020095430
Platform
Windows
Version information
Client:
Version: 29.8.2
API version: 1.56
Go version: go1.26.8
Git commit: 7fc2dff
Built: Wed Sep 30 19:35:42 2026
OS/Arch: windows/amd64
Context: desktop-linux
Server: Docker Desktop 4.94.0 (241994)
Engine:
Version: 29.8.2
API version: 1.56 (minimum version 1.40)
Go version: go1.26.8
Git commit: 8af9fe3
Built: Wed Sep 30 19:32:25 2026
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: v2.3.6
GitCommit: ee2735368117d2eb259779949d5e75cdafec9761
runc:
Version: 1.5.1
GitCommit: v1.5.1-0-g8f2685a4
docker-init:
Version: 0.19.0
GitCommit: de40ad0
Client:
Version: 29.8.2
Context: desktop-linux
Debug Mode: false
Plugins:
agent: Docker AI Agent Runner (Docker Inc.)
Version: v1.144.0
Path: C:\Program Files\Docker\cli-plugins\docker-agent.exe
ai: Docker AI Agent - Ask Gordon (Docker Inc.)
Version: v1.31.0
Path: C:\Program Files\Docker\cli-plugins\docker-ai.exe
buildx: Docker Buildx (Docker Inc.)
Version: v0.37.2
Path: C:\Program Files\Docker\cli-plugins\docker-buildx.exe
compose: Docker Compose (Docker Inc.)
Version: v5.5.1
Path: C:\Program Files\Docker\cli-plugins\docker-compose.exe
debug: Get a shell into any image or container (Docker Inc.)
Version: 0.0.47
Path: C:\Program Files\Docker\cli-plugins\docker-debug.exe
desktop: Docker Desktop commands (Docker Inc.)
Version: v0.4.4
Path: C:\Program Files\Docker\cli-plugins\docker-desktop.exe
dhi: CLI for managing Docker Hardened Images (Docker Inc.)
Version: v0.0.7
Path: C:\Program Files\Docker\cli-plugins\docker-dhi.exe
extension: Manages Docker extensions (Docker Inc.)
Version: v0.2.31
Path: C:\Program Files\Docker\cli-plugins\docker-extension.exe
init: Creates Docker-related starter files for your project (Docker Inc.)
Version: v1.4.0
Path: C:\Program Files\Docker\cli-plugins\docker-init.exe
mcp: Docker MCP Plugin (Docker Inc.)
Version: v0.44.1
Path: C:\Program Files\Docker\cli-plugins\docker-mcp.exe
model: Docker Model Runner (Docker Inc.)
Version: v1.2.6
Path: C:\Program Files\Docker\cli-plugins\docker-model.exe
offload: Docker Offload (Docker Inc.)
Version: v0.6.53
Path: C:\Program Files\Docker\cli-plugins\docker-offload.exe
pass: Docker Pass Secrets Manager Plugin (beta) (Docker Inc.)
Version: v0.2.4
Path: C:\Program Files\Docker\cli-plugins\docker-pass.exe
sandbox: "docker sandbox" is deprecated, use Docker Sandboxes instead (Docker Inc.)
Version: v0.13.0
Path: C:\Program Files\Docker\cli-plugins\docker-sandbox.exe
scout: Docker Scout (Docker Inc.)
Version: v1.25.0
Path: C:\Program Files\Docker\cli-plugins\docker-scout.exe
Server:
Containers: 5
Running: 5
Paused: 0
Stopped: 0
Images: 22
Server Version: 29.8.2
Storage Driver: overlayfs
driver-type: io.containerd.snapshotter.v1
Logging Driver: local
Cgroup Driver: cgroupfs
Cgroup Version: 2
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
CDI spec directories:
/etc/cdi
/var/run/cdi
Discovered Devices:
cdi: docker.com/gpu=webgpu
Swarm: inactive
Runtimes: runc io.containerd.runc.v2 nvidia
Default Runtime: runc
Init Binary: docker-init
containerd version: ee2735368117d2eb259779949d5e75cdafec9761
runc version: v1.5.1-0-g8f2685a4
init version: de40ad0
Security Options:
seccomp
Profile: builtin
cgroupns
Kernel Version: 6.18.54.1-microsoft-standard-WSL2
Operating System: Docker Desktop (containerized)
OSType: linux
Architecture: x86_64
CPUs: 8
Total Memory: 3.648GiB
Name: docker-desktop
ID: ac509b1c-367e-4dd2-b5dd-55c053009615
Docker Root Dir: /var/lib/docker
Debug Mode: false
HTTP Proxy: http.docker.internal:3128
HTTPS Proxy: http.docker.internal:3128
No Proxy: hubproxy.docker.internal
Labels:
com.docker.desktop.address=npipe://\\.\pipe\docker_cli
Experimental: false
Insecure Registries:
hubproxy.docker.internal:5555
127.0.0.0/8
::1/128
Live Restore Enabled: false
Firewall Backend: iptables
PS C:\Rick' Folder\OneDrive\RealEstateAnalyzer>Diagnostics ID
1FDDCE98-8AE7-40FF-BFC9-599C36FA4922/20261020095430
Activity