proxyconnect tcp: dial tcp 127.0.0.1:7890: connect: connection refused

gistfile1.txt

## Problem
When using Docker Desktop with WSL2 and Clash for Windows proxy, you may encounter this error:

```
target CONTAINER_NAME: failed to solve: python:3.12-slim: failed to resolve source metadata for docker.io/library/python:3.12-slim: failed to do request: Head "https://registry-1.docker.io/v2/library/python/manifests/3.12-slim": proxyconnect tcp: dial tcp 127.0.0.1:7890: connect: connection refused
```

## Solution
Follow these steps in order:

1. **Quit Docker Desktop** completely
2. **Stop Clash for Windows proxy**
3. **Open Docker Desktop** again

## Why This Works
The issue occurs because Docker Desktop is trying to use the proxy configuration even when the proxy is unavailable. By stopping the proxy before restarting Docker, it forces Docker to reset its network configuration and use direct connections to Docker Hub.