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Your Connection Information

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💡 Quick Tip: If you frequently mistype "localhost", consider adding "locallhost.dev" to your hosts file to redirect to 127.0.0.1, or use browser bookmarks for your common development URLs.

Quick Commands

Find what's using a port:
lsof -i :PORT (Mac/Linux)
netstat -ano | findstr :PORT (Windows)

Kill a process by PID:
kill -9 PID (Mac/Linux)
taskkill /PID PID /F (Windows)

Check if port is open:
telnet localhost PORT
nc -zv localhost PORT (Mac/Linux)

Start simple HTTP server:
python -m http.server PORT
npx http-server -p PORT

Common Development Ports

Looking for a specific port?

Web Development

Port 3000 - React, Express, Rails
Port 8080 - Spring Boot, Tomcat, Vue.js
Port 8000 - Django, PHP
Port 4200 - Angular, Ionic
Port 5000 - Flask, .NET Core, Python
Port 5173 - Vite.js, Vue 3, React
Port 9000 - SonarQube, PHP-FPM, Tomcat

Database Ports

Port 3306 - MySQL, MariaDB
Port 5432 - PostgreSQL
Port 27017 - MongoDB
Port 6379 - Redis
Port 1433 - SQL Server

Alternative Ports

Port 3001 - React/Node.js backup
Port 8081 - Spring Boot/Tomcat backup
Port 5001 - Flask/.NET backup
Port 4201 - Angular backup

Development Resources & Troubleshooting

Need help with development problems or want to learn more?

📚 Understanding Localhost - Complete guide to localhost and 127.0.0.1
Port Already in Use - How to find and kill processes
Connection Refused - Network connection troubleshooting
CORS Errors - Cross-origin request solutions
Localhost Not Working - General localhost issues

Your HTTP Request Headers

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localhost, locallhost:8080, localhost:3000, localhost:5000, development environment, local server, web development, frontend development, backend development, development tools, node.js, react, vue, angular, express, spring boot, django, rails, php, mysql, postgresql, mongodb