Python: sending data between two computers via sockets

Question

I am working on a script that would transmit the data between two distinct computers with access to the internet. I am using python's socket standard module. It works fine when I run both client and server on single computer but I am not able to make the things work when they run on different computers.

Here is a part of my server code:

import socket, time,os, random

class Server():
  def __init__(self,Adress=('',5000),MaxClient=1):
      self.s = socket.socket()
      self.s.bind(Adress)
      self.s.listen(MaxClient)
  def WaitForConnection(self):
      self.Client, self.Adr=(self.s.accept())
      print('Got a connection from: '+str(self.Client)+'.')


s = Server()
s.WaitForConnection()

And here is a part of my client code:

import socket

class Client():
   def __init__(self,Adress=("Here is the IP of the computer on which the \
                                   server scrip is running",5000)):
      self.s = socket.socket()
      self.s.connect(Adress)

c = Client()

When I run these scripts on two different computers with internet access the client is unable to connect and raises an error and the server is waiting for connections forever.

What am I doing wrong?

How are these two computers are connected? Any routers/firewalls/NAT devices on the path. — Nikolai Fetissov
– Nikolai Fetissov, Commented Dec 22, 2012 at 22:51
I dont really know. So you mean that my code should run fine? — Piotr Dabkowski
– Piotr Dabkowski, Commented Dec 22, 2012 at 23:18
Your code is fine: IMHO there is some other problem on the network layer. — Andreas Florath
– Andreas Florath, Commented Dec 22, 2012 at 23:27

Delimitry · Accepted Answer · 2015-05-09 20:03:34Z

9

This does probably not have to do with your code which looks okay. I rather think that this is a problem with the IP addresses that you're using.

If the computers are on different networks you need to make sure that the IP address that you're passing is the one accessible to the net. Basically what this means is that if the IP you're using starts with 192.168.?.? then you're using the wrong IP.

You can easily check this by running the command:
(windows): ipconfig
(linux): ifconfig

If you're using a correct IP address then I'd check my router settings and/or firewall settings which may very well block the port number that you're trying to use.

edited May 9, 2015 at 20:03

Delimitry

3,0374 gold badges33 silver badges39 bronze badges

answered Dec 22, 2012 at 23:39

Daniel Figueroa

10.7k5 gold badges49 silver badges68 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

l4mpi Over a year ago

I'm pretty sure it's a configuration issue because the router would need to forward the port to the lan address of the server...

Piotr Dabkowski Over a year ago

Problem solved. It was a problem with a router that was now redirecting the data packet to the computer where the server was set up. I have changed it in the router settings and made it to redirect the packet to the private IP of this computer (192.168.1.35) and port 5000. Now it works fine. Thank you very much :)

Collectives™ on Stack Overflow

Python: sending data between two computers via sockets

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related