CODEWITHSUNDEEP
pythonnetwork-programming
Loseb
Loseb

Reputation: 9

Simple Python Networking Problems

This is the server program

    # Echo server program
    import socket

    HOST = ''                 # Symbolic name meaning all available interfaces
    PORT = 50007              # Arbitrary non-privileged port
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.bind((HOST, PORT))
    s.listen(1)
    conn, addr = s.accept()
    print('Connected by', addr)
    while True:
        data = conn.recv(1024)
        if not data: break
        conn.sendall(data)
    conn.close()

Now, I was wondering if the port i'm using is let us say is 50007 and my friend who is on a uni computer wants to use the client program in order to connect to me. Then does he have to have port 50007 open as well? You know, in order for him to connect to me.

Here is the client program BTW:

    import socket

    HOST = 'daring.cwi.nl'    # The remote host
    PORT = 50007              # The same port as used by the server
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((HOST, PORT))
    s.sendall(b'Hello, world')
    data = s.recv(1024)
    s.close()
    print('Received', repr(data)

Upvotes: 0

Views: 554

Answers (2)

jfs
jfs

Reputation: 414159

uni network should allow outgoing tcp connections to port 50007. Your network should allow incoming tcp connections on port 50007.

Upvotes: 1

Hotchips
Hotchips

Reputation: 633

This will work (from a python sockets perspective). When your friend connects to your socket (which is 'open' by virtue of the the .accept() call), that connection will stay open until specifically closed, allowing you to send your message back.

Now, the problem could be the university firewall, which is almost certainly configured to not allow outbound (from him to you) connections on port 50007. If this is the case, unless you have administrator access for the uni firewall you won't be able to connect.

Upvotes: 0

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