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

Fix Windows Activation Version Mismatch After Upgrade

After upgrading Windows—whether from Home to Pro or from an older build to a newer one—you might ...

Fixing Windows Security 502 Bad Gateway Errors

If you see a 502 Bad Gateway error in Windows Security (or the Windows Defender portal), it usual...

How to Set Up Remote Desktop on Windows 11

Before You Start

Remote Desktop lets you connect to your Windows 11 PC from another devic...

MongoDB Authentication Failed: Causes and Fixes

You try to connect to MongoDB and get "Authentication failed" or similar error. This usually happ...

Fix Outlook Calendar Not Syncing with iPhone

You check your iPhone calendar and notice a meeting from yesterday still shows, or a new event yo...

How to Enable DNS over HTTPS in Chrome

If you've noticed that your browser seems to be leaking DNS queries or you want to prevent your I...