使用 socket python 连接不同网络上的两台计算机

Question

I am trying to connect two computers in different networks using the socket library. On the first try I tried to connect two computers in the same network and it worked. Then I tried to connect my friend's computer with mine in different networks, making various attempts and various searches I could not connect the two computers, I disabled the firewalls of both the server (my computer) and the client (computer of the my friend), but nothing, they don't connect. Below the source code of the client and server. What did I do wrong? Server-side source code:

import socket
host = socket.gethostbyname(socket.gethostname())
port = 9999

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind((host,port))
sock.listen(1)
print(f"Server's ip: {host}\n Server's port: {port}")
print(f"Waiting for incoming connections...")
client, addr = sock.accept()
print(f"{addr} connected")

Client-side code:

import socket

host = "192.168.1.XXX"

port = 9999

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((host,port))
print("You are connected!")

After some time python gives this error:

TimeoutError: [Errno 119] Connection timed out

Answer 1

好的，我解决了问题，我只需要从路由器设置中打开端口 9999。