Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You try to install a Python package with pip install somepackage and get a Per...

How to Fix Cloudflare 522 Error: Check Your Origin Server
If you're seeing a 522 Connection Timed Out error in your browser when visit...

Fix Nginx Upstream Connection Refused Socket Error
When Nginx returns a 502 Bad Gateway or logs upstream connection refused

Fix Cloudflare Wildcard Subdomain Not Working
If you've set up a wildcard DNS record in Cloudflare (e.g., *.example.com) but s...

Fix Cloudflare 522 Error with Nginx Configuration
You're seeing a Cloudflare 522 error: connection timed out between Cloudflare and your origin...

Fix VSCode Terminal Not Opening with Git Bash
You open Visual Studio Code, press Ctrl+` to bring up the terminal, and expect Git Bash. Instead,...