Errno 10061: The connection could not be made because the target machine actively refused it (client-server)

I have a problem with these client and server codes, I keep getting [Errno 10061]. No connection can be made because the target machine has actively refused it

I am running a server in a Windows XP SP3 virtual machine and a client on Windows 7 64bit, my python version is 2.7.3. I want to know how to change the code to use client and server on different networks! Thank you!

server:

#!/usr/bin/python           # This is server.py file

import socket               # Import socket module
s = socket.socket()         # Create a socket object
host = '0.0.0.0' # Get local machine name
port = 12345                # Reserve a port for your service.


print 'Server started!'
print 'Waiting for clients...'

s.bind((host, port))        # Bind to the port
s.listen(5)                 # Now wait for client connection.
c, addr = s.accept()     # Establish connection with client.
print 'Got connection from', addr
while True:
  msg = c.recv(1024)
  print addr, ' >> ', msg
  msg = raw_input('SERVER >> ')
  c.send(msg);
  #c.close()                # Close the connection

      

        
        
        
      

    

customer:

#!/usr/bin/python           # This is client.py file

import socket               # Import socket module

s = socket.socket()         # Create a socket object
host = socket.gethostname() # Get local machine name
port = 12345                # Reserve a port for your service.

print 'Connecting to ', host, port
s.connect((host, port))

while True:
  msg = raw_input('CLIENT >> ')
  s.send(msg)
  msg = s.recv(1024)
  print 'SERVER >> ', msg
#s.close                     # Close the socket when done

      

        
        
        
      

    

PS: the code is from the internet.