python - Flask 'Cannot assign requested address' error when binding to a specific IP on Pterodactyl - Stack Over

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I have Virtual Dedicated Server based on Ubuntu 20.04.6 with IP address 193.23.xxx.xx. blizcore.fun resolves to this IP. On this server I installed pterodactyl panel. Pterodactyl have IP 172.18.0.0/16. I install basic python 3.10 egg on pterodactyl and create server to port 6668.

My target: create GET request to /status. This request should be handled by the Flask server running within the Pterodactyl environment.

Code:

from flask import Flask, request
from flask_restful import Api, Resource, abort

from dotenv import load_dotenv
load_dotenv()
import os

key = os.getenv("AUTH_KEY")

app = Flask(__name__)
api = Api()

class BlizcoreApi(Resource):
    def get(self):
        headers = request.headers
        auth = headers.get("Authorization")
        if auth == key:
            return {"code": 200, "message": "All working stable."}
        else:
            return abort(401, message="Unauthorized.")
    

api.add_resource(BlizcoreApi, "/status")
api.init_app(app)

if __name__ == "__main__":
    app.run(host="193.23.220.14", port=6668, debug=True)

But i have error (console output of server on port 6668):

 * Serving Flask app 'server'
 * Debug mode: on
Cannot assign requested address

I tried connect flask to host 0.0.0.0 for listen on all interfaces and Im connected to pterodactyl IP (console output after these actions):

* Serving Flask app 'server'
 * Debug mode: on
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
 * Running on all addresses (0.0.0.0)
 * Running on http://127.0.0.1:6668
 * Running on http://172.18.0.6:6668
Press CTRL+C to quit
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 144-915-975

Rules on Firewall looks like that:

root@vm25-lendnodes:~# sudo ufw status
Status: active

To                         Action      From
--                         ------      ----
22                         ALLOW       Anywhere                  
80                         ALLOW       Anywhere                  
443                        ALLOW       Anywhere                  
...
6668                       ALLOW       172.18.0.0/24
...

I think I need to make a router to connect the stream from 172.18.0.6:6668 to 193.23.xxx.xx:6668, but it just my theory.

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