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

UFW Deny Port But Still Accessible: Fixes and Checks

You set a UFW deny rule for a specific port, but the port remains accessible from outside. This i...

PowerShell High CPU Usage: Setup and Optimization Guide

You launch PowerShell and notice your CPU usage spikes to 80% or more, even when you're not runni...

How to Fix Abnormal Memory Usage in CMD on Windows

How to Fix Windows Defender Version Mismatch Error

You may see a Windows Defender version mismatch error if the security intelligence definitions on...

Fix Nginx Permission Denied Errors: Common Setup Mistakes

You've installed nginx, configured a server block, and when you try to start it, you see pe...