Node.js/Express.js App Only Works on Port 3000

Question

I have a Node.js/Express.js app running on my server that only works on port 3000 and I\'m trying to figure out why. Here\'s what I\'ve found:

• Without specifyi

Answer 1

Noticed this was never resolved... You likely have a firewall in front of your machine blocking those ports, or iptables is set up to prevent the use of those ports.

Try running nmap -F localhost when you run your app (install nmap if you don't have it). If it appears that you're running the app on the correct port and you can't access it via a remote browser then there is some middleware or a physical firewall that's blocking the port.

Hope this helps!