On localhost, the server responds normally, but not on the server?

Question

Node.js

Here is such a strange problem... I have Node.JS installed both on my computer and on the server. On the computer, I calmly make a server on port 3050 and it just as calmly answers, but on the server it does not give errors, but when I try to access it according to the ip:port scheme, it thinks for a long time and then the connection is terminated by timeout ...
Code - https://pastebin .com/qBieAMej

Answer 1

is the port on the server open?