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

How to Clear SSH Known Hosts and Fix Host Key Verification Failed

Cloudflare Tunnel Health Check Troubleshooting Guide

When a Cloudflare Tunnel (formerly Argo Tunnel) health check fails, your origin server may be mar...

Fixing WinRAR Checksum Errors When Extracting RAR Archives

You're extracting a RAR archive and WinRAR stops with a "checksum error" message. This usually me...

Fix Windows Update Stuck on 'Checking for Updates'

You start your PC, open Windows Update, and it sits on 'Checking for updates' for 10, 20, 30 minu...

Fix Windows Defender DNS Error on Windows 11

You open Windows Security and see a warning about a DNS error, or Windows Defender cannot update ...

Fix 'Windows Activation Script Not Working Command Not Found' Error

When you run a Windows activation script (typically a .bat or .ps1 file) and see 'command not fou...