How to run websocket on centos7 server?

Question

CentOS

Hi all!
I ran into a problem, on the project I raised websockets using Ratchet, took port 8888, everything is fine on the local machine, started the daemon and javascript calmly accesses this port via ws://site.ru/online.
But when I uploaded everything to the server (Centos 7), then in js I get the following error:

WebSocket connection to 'ws://site.ru/online' failed: Error in connection establishment: net::ERR_CONNECTION_REFUSED

I have vestacp, I have prescribed rules for iptables: ACCEPT 0.0.0.0/0 8888 tcp
Additionally, I have registered access to this port with the hoster.
I even tried disabling the firewall with iptables.
In processes the demon is twisted.
But I still get this error...
Once I tried to raise web sockets on debian and it was enough to register them in iptables and everything worked.

Answer 1

I found a solution, in general, do not use the ratchet example on github https://github.com/ratchetphp/Ratchet,
There is another example of raising a websocket on the off site

$server = IoServer::factory(
                new HttpServer(
                    new WsServer(
                        new $server
                    )
                ),
                $port
            );

            $server->run();