Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you see fatal: unable to access 'https://github.com/...': SSL certificate proble...

Fix Nginx 502 Bad Gateway with Docker Socket
You have an Nginx container proxying requests to another container via the Docker socket, and you...

Fix Cloudflare Wildcard Subdomain and Root Domain Conflict
If you use a wildcard DNS record (e.g., *.example.com) on Cloudflare, you may run in...

Fix Git Clone Connection Timed Out on Windows 10
When you run git clone on Windows 10 and see a connection timed out error, it usuall...

Docker Container Exits Immediately in Docker Compose
If your Docker container exits immediately after starting with docker compose up, it...

Fix VS Code Breakpoint Not Hit in Express App
You set a breakpoint in your Express route handler, start debugging, and the breakpoint is never ...