Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When Windows Search stops returning files or emails, or the search box hangs, a corrupt index dat...

You try to install a Python package with pip, and get an error like error: externally-manag...

Git index.lock File Exists: Quick Fix Checklist
You try to run a Git command and see fatal: Unable to create 'path/.git/index.lock'...

Fix Nginx Upstream Connection Refused Error
If you see upstream connection refused in your Nginx error logs, it means Nginx trie...

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...

How to Fix Git Authentication Failed in VS Code
You're in VS Code, push or pull fails with "Authentication failed"—this is common and...