Socket-client doesn't connect to socket-server on VPS

I try to make simple socket server but it just doesn't work. Client doesn't connect to server. And finally I get 10060 WinError. I tried pure socket implementation, I tried websockets implementation.

Pure socket [SERVER]:

import socket    
HOST = 'XXX.XXX.XX.XX'
PORT = 65000   

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.bind((HOST, PORT))
    s.listen()
    conn, addr = s.accept()
    with conn:
        print('Connected by', addr)
        while True:
            data = conn.recv(1024)
            if not data:
                break
            conn.sendall(data)
    
    asyncio.get_event_loop().run_until_complete(start_server)
    asyncio.get_event_loop().run_forever()

Puse socket [CLIENT]:

import socket

HOST = 'XXX.XXX.XX.XX'  
PORT = 65000        

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.connect((HOST, PORT))
    s.sendall(b'Hello, world')
    data = s.recv(1024)

print('Received', repr(data))

WebSockets [SERVER]:

import asyncio
import websockets

async def hello(websocket, path):
    name = await websocket.recv()
    print("<",name)

    greeting = "Hello " + name + "!"

    await websocket.send(greeting)
    print(">", greeting)

    start_server = websockets.serve(hello, "XXX.XXX.XX.XX", 18765)
    
    asyncio.get_event_loop().run_until_complete(start_server)
    asyncio.get_event_loop().run_forever()

WebSockets [CLIENT]:

import asyncio
import websockets

async def hello():
    uri = "ws://XXX.XXX.XX.XX:18765"
    async with websockets.connect(uri) as websocket:
        name = input("What's your name? ")

    await websocket.send(name)
    print(f">", name)

    greeting = await websocket.recv()
    print(f"<", greeting)

asyncio.get_event_loop().run_until_complete(hello())

VPS OS - Debian 9, if it matters :/