Knowledge base for software setup, errors, and daily tool work.

Fix Windows 11 WiFi Connected but No Internet After Sleep

You wake your Windows 11 PC from sleep, the WiFi icon shows connected, but you can't load any...

Renew an Expired Cloudflare Origin Certificate: Step-by-Step

If your Cloudflare origin certificate has expired, visitors will see SSL errors and your server m...

How to Fix Git Detached HEAD State and Undo Changes

You run git status and see something like "HEAD detached at abc123". This ha...

Fix Windows Defender Real-Time Protection Not Starting

If you see a yellow warning or a message that real-time protection is off, Windows Defender’s cor...

Fix Cloudflare 521 Error Due to Server Overload

You see a Cloudflare 521 error page. The message says the web server is down. Often, this means y...

Fix Nginx Permission Denied for Static Files

Common Causes

When Nginx returns a 403 Forbidden or 'permission denied' error for...