Checklists for software errors, setup, and tool workflows.

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Fix ERR_NAME_NOT_RESOLVED Caused by Antivirus Block

If you see ERR_NAME_NOT_RESOLVED in Chrome, it usually means the browser can'...

Fix Nginx Upstream Connection Refused Behind Cloudflare

If you see upstream connection refused in your Nginx error logs while using Cloudfla...

Fix Nginx Configuration Test Failure from Rewrite Rules

You run nginx -t and get an error. The log points to a rewrite rule. This is common ...

Fix Windows 11 WiFi No Internet Due to Proxy Settings

If your Windows 11 laptop shows full WiFi bars but browsers say “No internet,” a common culprit i...

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 Windows Defender Real-Time Protection Configuration Error
You open Windows Security and see a message that real-time protection is turned off or has a conf...