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

Nginx 502 Bad Gateway: PHP-FPM Fix Guide

Seeing a 502 Bad Gateway error from Nginx usually means it can't reach PHP-FPM. This is common af...

Windows Security for Ubuntu Installation Checklist

Before You Install Ubuntu

If you're dual-booting Windows and Ubuntu, or replacing Windows...

Fix Windows Activation DNS Failure via Command Prompt

When Windows fails to activate, you may see errors like '0x80072EE2' or 'We can't activate Window...

How to Fix Outlook 404 Not Found When Clicking Links

When you click a link in an Outlook email and see a '404 Not Found' error, it usually means the l...

Fix WinRAR Checksum Error on Windows 10

If you see a 'Checksum error' or 'CRC failed' message when extracting a RAR or ZIP file in WinRAR...

Fix Microsoft Teams Microphone Not Working in Windows 11

If your microphone stops working in Microsoft Teams on Windows 11, the problem is usually a permi...