mean.io 127.0.0.1:3000无法通过外部ip访问

Question

I'm currently running on Centos 7. The command netstat -tulpen shows this:

I have run gulp based on the tutorial in mean.io. I run curl http://localhost:3000/ which works fine. Everything is displayed in the localhost. But when i try to access it via external ip, it is not showing anything. Eg. http://192.168.0.127:3000/ . I think it is something related to the firewall, but I have set it accordingly because I can access http://192.168.0.127:8080/ just fine. Just that I can't access anything that has the local address of 127.0.0.1:ports but I can access 0.0.0.0:ports

Answer 1

The problem is that you're listening on the wrong network interface. 127.0.0.1 indicates that a daemon should listen on the loopback network interface, which does exactly what it sounds like - when traffic is sent to it, it will "loop back" to the same computer instead of being sent over the network. Because you're listening on the loopback interface, only traffic coming from the loopback interface (and thus, your local machine) will actually be sent to your daemon.

The solution is to bind to 0.0.0.0 . 0.0.0.0 indicates that the program should bind to all network interfaces, including your external interface. With that in place, traffic will be routed correctly to your daemon.