import socket, time, thread

def clientRun(serv_addr):
    cli = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    cli.connect(serv_addr)
    time.sleep(0.1)
    cli.shutdown(2)
    cli.close()

serv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
serv.bind(('localhost', 0))
serv_addr = serv.getsockname()
serv.listen(5)
client_thread = thread.start_new_thread(clientRun, (serv_addr,))
conn, addr = serv.accept()
conn.close()
time.sleep(0.2)