Egg.js deployment Tencent Cloud CVM cannot be accessed through public network

problem description

after the egg.js project is started on the server, the page cannot be accessed by the public network. The service startup was successful

[egg-scripts] Save log file to /root/logs
[egg-scripts] Wait Start: 1...
[egg-scripts] egg started on http://127.0.0.1:7001

the environmental background of the problems and what methods you have tried

background: transfer the local egg.js project to Tencent Cloud server for deployment.
try method:
1. Change the service ipv6 to ipv4:

COMMAND   PID USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
node    15983 root   21u  IPv4 38856616      0t0  TCP VM_0_13_centos:afs3-callback (LISTEN)

2, pm2 start:

[PM2] Starting /root/egg-example/server.js in fork_mode (1 instance)
[PM2] Done.

 App name  id  version  mode  pid    status  restart  uptime  cpu  mem       user  watching 

 server    0   1.0.0    fork  17017  online  0        0s      0%   3.1 MB    root  disabled 

 Use `pm2 show <id|name>` to get more details about an app

3. Server port opening setting:

related codes

/ / Please paste the code text below (do not replace the code with pictures)

what result do you expect? What is the error message actually seen?

I created a new server.js file in the root directory of the project:

"use strict";
const http = require("http");
const app = http.createServer((req, res) => {
  res.end("123");
});
app.listen("9600", () => console.log("success"));

after running, it is found that the external network can be accessed, but in this way, the service will be invalid after the console is disconnected.
I don"t understand what the problem is right now. What"s the difference between the two.

ask the bosses to give me some advice. No, no, no. It was a rough day yesterday

ip:94.191.30.199
password Aa12345678