Curl amazon EC2 instance

Question

I have a web server running on an Ubuntu Amazon EC2 instance at port 3000. 15.0.0.10 is the private ip of this EC2 instance.

After I ssh into this instance and run the following command curl localhost:3000/index.html, it returns me the html source of my index.html page.

But when I run curl 15.0.0.10:3000/index.html, it says :

curl: (7) couldn't connect to host

1. Why is this happening ?
2. What can I do to make the second command also return the content?

Answer 1

You need to ensure that the server is running on 0.0.0.0 if you need it to be reachable by addressing any IP of the instance.

If you have started it on localhost (127.0.0.1), then the behavior is expected. You can stop the server and re-start it to bind to 0.0.0.0:3000. Things should work.