Thanks for the report.

It seems to only affect Windows, and only when using sockets rather than pipes.

Till this is fixed you could use

    temp = bool(multiprocessing.connection.wait([cl], 1))

instead of

    temp = cl.poll(1)


As I mentioned on the other issue, I would not advise use of Listener() and Client() without using authentication -- you are probably better off using raw sockets and select().