Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you run git clone and see connection timed out after 30 seconds, i...

You're installing a package with pip, and suddenly you see a wall of red text: ERROR: C...

How to Diagnose and Fix Chrome Memory Leaks
If your Chrome browser gradually consumes more and more RAM until pages lag or crash, you may be ...

Fix VSCode Git Authentication Failure with Bitbucket
You're working in Visual Studio Code, you try to push or pull from a Bitbucket repository, an...

Fix Nginx 'upstream connection refused' When Talking to PHP-FPM
You're seeing upstream connection refused in your Nginx error log, and your site...

Nginx Redirect Loop Not Working: Causes and Fixes
You've set up a redirect in Nginx, but instead of landing on the intended URL, the browser sh...