ZeroMQ hangs in a python multiprocessing class/object solution

I'm trying to use ZeroMQ in Python (pyzmq) together with multiprocessing. As a minmal (not) working example I have a server- and a client-class which both inherit from multiprocessing.Process. The client as a child-process should send a message to the server-child-process which should print the message:

#mpzmq_class.py

from multiprocessing import Process
import zmq


class Server(Process):
    def __init__(self):
        super(Server, self).__init__()
        self.ctx = zmq.Context()
        self.socket = self.ctx.socket(zmq.PULL)
        self.socket.connect("tcp://localhost:6068")

    def run(self):
        msg = self.socket.recv_string()
        print(msg)


class Client(Process):
    def __init__(self):
        super(Client, self).__init__()
        self.ctx = zmq.Context()
        self.socket = self.ctx.socket(zmq.PUSH)
        self.socket.bind("tcp://*:6068")

    def run(self):
        msg = "Hello World!"
        self.socket.send_string(msg)

if __name__ == "__main__":
    s = Server()
    c = Client()
    s.start()
    c.start()
    s.join()
    c.join()

Now if I run this the server-process seems to hang at the receive-call msg = socket.receive_string(). In another (more complicated) case, it even hung at the socket.connect("...")-statement.

If I rewrite the script to use functions instead of classes/objects, it runs just fine:

# mpzmq_function.py

from multiprocessing import Process
import zmq


def server():
    ctx = zmq.Context()
    socket = ctx.socket(zmq.PULL)
    socket.connect("tcp://localhost:6068")
    msg = socket.recv_string()
    print(msg)


def client():
    ctx = zmq.Context()
    socket = ctx.socket(zmq.PUSH)
    socket.bind("tcp://*:6068")
    msg = "Hello World!"
    socket.send_string(msg)

if __name__ == "__main__":
    s = Process(target=server)
    c = Process(target=client)
    s.start()
    c.start()
    s.join()
    c.join()

Output:

paul@AP-X:~$ python3 mpzmq_function.py 
Hello World!

Can anybody help me with this? I guess it's something I didn't understand concerning the usage of multiprocessing.

Thank you!