Python socket server on azure vm

Question

I have an azure vm running Linux (ubuntu 18.04) LTS and i have created a python socket server binding a socket with

socket.bind(('localhost', 10000))

but when i try to connect from another script via

socket.connect(ip,10000)

the server reject the connection.

How do i solve this?

I already tried to open the port on my wm with

az vm open-port --resource-group myResourceGroup --name myVM --port 10000

But the server still refuse my connection.

Client script:

import socket
import threading

class Client:
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    def sendData(self):
        while True:
            self.sock.send(bytes(input("")))

    def __init__(self):
        self.sock.connect(('serverip', 10000))
        iThread = threading.Thread(target=self.sendData)
        iThread.daemon = True
        iThread.start()

        while True:
            data = self.sock.recv(1024)
            if not data:
                break
            print(data)

client = Client()

Server script:

import socket
import threading
import random

def getuserdata(b):
    #function that works
    return a

class Server:
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    connections = []
    def __init__(self):
        self.sock.bind(('localhost', 10000))
        self.sock.listen(1)
        print (self.sock.getsockname())

    def handler(self, c , a):
        while True:
            try:
                data = c.recv(1024)
            except:
                self.connections.remove(c)
                c.close()
                print(str(a[0]) + ":" + str(a[1]), "disconnected")
                print("lobby has " + str(len(self.connections)) + " players connected")
                break
            #loop per client
            #for connection in self.connections:
            #    connection.send(data)

    def run(self):
        while True:
            if len(self.connections) < 8:
                c , a = self.sock.accept()
                cThread = threading.Thread(target=self.handler , args=(c,a))
                cThread.daemon = True
                cThread.start()
                self.connections.append(c)
                print(str(a[0]) + ":" + str(a[1]) , "connected")
                print("lobby has " + str(len(self.connections)) + " players connected")
            #loop del server
            else:
                break
        print("lobby piena")
        list= getuserdata(8)
        for index, player in enumerate(self.connections):
            player.send(bytes(list[index]))
        while True:
            pass

server = Server()
server.run()

Answer 1

Please use 0.0.0.0 or the IP address of your Azure Ubuntu VM instead of localhost as server socket bind host.

If you use localhost as host bind by socket server, then just only client on the same machine can connect to your server, because localhost means 127.0.0.1 which only allow client connect to the server IP address 127.0.0.1 .

Meanwhile, you need to refer to the offical documents Tutorial: Create and manage Azure virtual networks for Linux virtual machines with the Azure CLI or How to open ports to a virtual machine with the Azure portal to add an inbound rule in the NSG setting of networking via Azure CLI or on portal.