refused connection

[Gribouillis]

The server should not call s.connect((host, port)) but s.bind((host, port)).

Also I recommend that before calling bind() the server configures the socket with

s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

this is useful if you start the server several times and you don't want to receive the error address already in use.