Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You click a PDF link in Chrome and instead of the document, you see an error: Access Violatio...

Fix Python Permission Denied When Installing Packages on Windows
You run pip install somepackage on Windows and get a PermissionError

Fix Nginx 502 Bad Gateway with Docker Environment Variables
If you see a 502 Bad Gateway from nginx running in Docker, it usually means ngin...

Fix Chrome Certificate Error Invalid Authority on Mac
You're browsing in Chrome on a Mac and suddenly see a warning: Your connection is not...

Fix VSCode Git Auth Failed: Expired Token
You're working in Visual Studio Code, try to push or pull, and see an error like "Git: Au...

Fix Nginx HTTP to HTTPS Redirect Loop Error
You set up an HTTP-to-HTTPS redirect in nginx, but now your browser shows a redirect loop error. ...