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

Fix Windows Activation Invalid Configuration via Command Prompt

You might see an error like “Windows Activation: Invalid product key or configuration” after a ha...

How to Free Up a Port in Command Prompt (Windows)

When an application fails to start because a port is already in use, you need to free that port. ...

How to Fix Windows Defender Firewall Blocked App

You try to open an app, but it either won't start or can't connect to the internet. A common caus...

Configure Proxy Settings for Windows Update

If Windows Update fails to check for updates or downloads get stuck, a misconfigured proxy is a c...

Windows Security for Ubuntu Installation Checklist

Before You Install Ubuntu

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

Fix WSL Ubuntu resolv.conf Reset on Every Reboot

If you run Ubuntu on WSL and you've manually edited /etc/resolv.conf to set custom D...