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

Windows Security Firewall Configuration Checklist

If you've ever enabled the Windows Firewall and suddenly lost access to a shared printer or could...

Microsoft Store High CPU Usage: Troubleshooting Checklist

You open Task Manager and see Microsoft Store eating 20-30% CPU, fan spinning up, system sluggish...

Windows Security Troubleshooting Guide

Windows Security (formerly Windows Defender) usually runs quietly in the background, but sometime...

Fix Chrome ERR_TUNNEL_CONNECTION_FAILED on Windows 10

If you see ERR_TUNNEL_CONNECTION_FAILED in Chrome while browsing on Windows 10, ...

Fix 'Windows Security Authentication Failed' for Domain Credentials

Nginx 502 Bad Gateway: A Practical Troubleshooting Guide

Seeing a 502 Bad Gateway from Nginx usually means the upstream server (like PHP-FPM, uWSGI, or a ...