Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you're seeing an infinite redirect loop when trying to force HTTPS in nginx, the browser u...

You've configured nginx, but when you try to access your site, you see a 403 Forbidden<...

Fix Docker Nginx 502 Bad Gateway with MySQL
You have a Dockerized web app behind Nginx, and you're seeing a 502 Bad Gateway error. The ap...

Fix Cloudflare Wildcard Subdomain DNS Propagation Delay
You set up a wildcard DNS record (e.g., *.example.com) in Cloudflare, but new subdom...

Fix 'Port Already Used by Another Container' in Docker Compose
When you run docker compose up and see an error like port is already allocated...

VSCode IntelliSense Not Working for React: Fixes
You open a React component in VSCode, start typing a prop or a hook, and get no suggestions. Inte...