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

Change Remote Desktop Listening Port to Avoid Conflicts

If you cannot connect to a remote computer because another application is using port 3389, or you...

Fix GitHub Actions Cache Action Permission Denied Error

Fix Jupyter Notebook Token Expired or Invalid Error

When you try to open Jupyter Notebook and see “token expired” or “invalid token,” it usually mean...

How to Fix Windows Defender High CPU Usage

If your system feels sluggish and Task Manager shows Windows Defender (Microsoft Defender Antivir...

How to Reinstall the Windows Security Module

If Windows Security won't open, shows errors, or you see "This app has been turned off" messages,...

BitLocker DNS Error Checklist for IT Admins

IT admins sometimes see DNS-related errors when BitLocker attempts network unlock or contacts a r...