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

Cloudflare 521 Error: Server Timeout – Causes and Fixes

Cloudflare 521 error indicates the web server is down or unreachable. It appears as “web server i...

Fix Nginx Permission Denied on CentOS: A Practical Guide

You're setting up Nginx on CentOS and hitting a 'permission denied' error in the erro...

Fix Cloudflare Wildcard Subdomain Not Working

If you've set up a wildcard DNS record in Cloudflare (e.g., *.example.com) but s...

Fix Node Sass Build Failure After npm Cache Clean

VSCode IntelliSense Not Working for React: Fixes

You open a React component in VSCode, start typing a prop or a hook, and get no suggestions. Inte...

Docker Compose Environment Variable from Shell Not Working: Fixes

You set an environment variable in your shell, but Docker Compose ignores it. This is a common pi...