Why is the program not visible from the outside?

Question

Java

Good afternoon, I wrote a program, uploaded it to the server, OpenJRE 11 is running there.
My program is a simple web socket server.
I run the program on the server, I try to connect to it from the outside, as if there is no access to the program ...
Here is the code that starts the server itself:

WebSocketServer webSocketServer = new WSServer(
                    new InetSocketAddress(Settings.WS_HOST_VALUE, Settings.WS_PORT_VALUE)
            );
            webSocketServer.run();

I connect via ssh, there I type the command:
netstat -ntlp | grep LISTEN
Writes:

tcp        0      0 (мой ip):8887      0.0.0.0:*               LISTEN      20355/java

The service https://portscaner.ru writes that such a port is open.
iptables -L
Gives me this:

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

What am I doing wrong?

Answer 1

you didn't enter your IP. if this IP is from the range of one of the private subnets, then it is not accessible from the Internet.