Programming Tutorials

  Deploying a Node.js application on shared hosting environments like Namecheap's "Stellar" or "Stellar Plus" plans often feels like a victory—until you load the page and see the dreaded   503 Service Unavailable   error. For students and developers accustomed to VPS environments (DigitalOcean, AWS) or  localhost , this error is confusing. The server is running, the files are there, but the application refuses to connect. This guide provides a definitive technical solution to this specific error. We will bypass generic troubleshooting and focus on the architecture of cPanel's Node.js selector, the  package.json  configuration, and the resource limits that actually cause this crash. The Root Cause: Phusion Passenger and Port Binding To fix the error, you must understand why it happens. When you run  node server.js  on your laptop, your application binds directly to a specific port (e.g.,  localhost:3000 ). You access it directly via that port....