Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

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Latest checklists

When Nginx returns a 502 Bad Gateway or logs upstream connection refused

Fix Git 'index.lock' File Exists Error in IntelliJ
If you see an error like fatal: Unable to create 'project/.git/index.lock': File ex...

Fix VS Code Git Authentication Failed After Update
After updating Visual Studio Code, you may see an error like "Git: Authentication failed"...

Windows 11 Update Stuck at 0%? Here's How to Fix It
You click "Check for updates" and see the download sitting at 0% for minutes or hours. Th...

Fix ERR_NAME_NOT_RESOLVED in Chrome: Proxy Settings Guide
If you see ERR_NAME_NOT_RESOLVED in Chrome, it usually means the browser can'...

Fix DNS Probe Finished NXDOMAIN for a Specific Website
If you see the error "DNS_PROBE_FINISHED_NXDOMAIN" in Chrome when trying to visit a speci...