Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

View list

Fixing Nginx Upstream Connection Refused on Port 443

You see "upstream connection refused" in your Nginx error log when proxying requests to p...

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...

Windows Security App Won't Open in Safe Mode: Fixes

If you’re in Safe Mode and the Windows Security app refuses to open—showing a blank window, crash...

How to Restore Missing Windows Taskbar Icons

You open Windows and notice some taskbar icons are gone—maybe the volume, network, or battery ico...

How to Resolve Git SSL Certificate Error: Unable to Get Local Issuer

If you see fatal: unable to access 'https://...': SSL certificate problem: unable t...

Fix Windows Update Service Not Running in Event Viewer
You open Event Viewer to check for errors after a failed Windows Update, and you see an event sta...