Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you're seeing upstream connection refused in your Nginx error logs, it usuall...

If you see errors like Module build failed: Error: Node Sass does not yet support your curr...

Fix 'Permission Denied' in VS Code Terminal on Mac
You're working in VS Code on a Mac, and when you try to run a command in the integrated termi...

Fix Blue Screen Loop After Windows 11 Update
You install a Windows 11 update, restart, and then get stuck in a blue screen loop—the system cra...

Fixing Nginx Upstream Connection Refused and Permission Denied
If you see connect() failed (111: Connection refused) or connect() failed (13:...

Fix 'Permission Denied' in VS Code Terminal for Python
You're in VS Code, you open the terminal, type python script.py, and get p...