Python套接字：连接超时

Question

I'm trying to write two short python scripts that will connect two or more machines to each other, one as the server and the others as clients. It worked perfectly when testing the client and the server script on the same computer, but when I tried it from another computer the client kept timing out; it couldn't connect to the server. Here's my server code:

import socket
server = socket.socket()
host = "computername"
port = 12345
server.bind((host, port))
server.listen(5)

client, addr = server.accept()

Client code:

import socket
server = socket.socket()
host = "computername"
port = 12345
server.connect((host, port))

Any clue as to why the machines can't connect?

Answer 1

I think, you are changing host variable properly when running both client and server scripts in different machines. Try by changing that properly/or using IP address of server machine.

Answer 2

The communication could be prohibited by a firewall.

To rule out DNS related problem, try IPs instead of hostnames:

# server: listen on all interfaces
server.bind(('', port))

and:

# client: specify server's IP address
server.connect(("192.168.XX.YY", port))

with a real IP address, of course.