How to connect 2 computers on diffrent networks using python sockets

Question

I'm trying to connect 2 different computers that on different networks, but I got an error:

TimeoutError: [Errno 110] Connection timed out

And sometimes I got this error:

OSError: [Errno 113] No route to host

I wrote the server.py script and started it on the first pc and client.py on the second one.

server.py

import socket
server_socket = socket.socket()
server_socket.bind(("127.0.0.1", 80))
server_socket.listen(1)
(client_socket, client_address) = server_socket.accept()
print ("client_connected [" + client_address[0] + "]")
client_command = client_socket.recv(1024).decode()
print(client_command.encode())

client.py

import socket
client_socket = socket.socket()
client_socket.connect(("server_public_ip_here", 8820))
client_command = input("command: ")
client_socket.send(client_command.encode())
data = client_socket.recv(1024).decode()
print("server: " + data)

I expect to get a connections between the computers but keep getting a TimeoutError or OSError

It looks like you are listening on port 80 but trying to connect to port 8820. — John Anderson
– John Anderson, Commented Apr 19, 2019 at 13:07
Also, you're binding to 127.0.0.1 and connecting to a different IP. — Rafael Almeida
– Rafael Almeida, Commented Apr 19, 2019 at 13:08

progmatico · Accepted Answer · 2019-04-19 15:18:40Z

1

if you are on two separate computers you should bind to 0.0.0.0 (to listen to all network connections) or to the server's IP for connections on that IP, and not 127.0.0.1 (localhost). Works if client and server are both in the same machine. Also you should use the same port on client and server.

I test it and it worked:

server.py

import socket
server_socket = socket.socket()
server_socket.bind(("0.0.0.0", 8000))
server_socket.listen(1)
(client_socket, client_address) = server_socket.accept()
print ("client_connected [" + client_address[0] + "]")
client_command = client_socket.recv(1024).decode()
print(client_command.encode())

client.py

import socket
client_socket = socket.socket()
client_socket.connect(("127.0.0.1", 8000)) #or enter ip of server
client_command = input("command: ")
client_socket.send(client_command.encode())
data = client_socket.recv(1024).decode()
print("server: " + data)

edited Apr 19, 2019 at 15:18

progmatico

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answered Apr 19, 2019 at 13:09

Amir H. Rassafi

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1 Comment

Misho Janev Over a year ago

A few notes: 1. Avoid using 8000 as a port or any that start with 80 for that matter, many other server applications use them. 2. Make sure you have set your firewall policies correctly for TCP traffic on the port you are using for both machines.

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