Patch based on http://bugs.python.org/issue6645 --- Python-2.7.9/Lib/multiprocessing/process.py.nourandom 2014-12-10 16:59:39.000000000 +0100 +++ Python-2.7.9/Lib/multiprocessing/process.py 2015-04-20 08:20:38.663871000 +0200 @@ -306,7 +306,12 @@ self._popen = None self._counter = itertools.count(1) self._children = set() - self._authkey = AuthenticationString(os.urandom(32)) + try: + self._authkey = AuthenticationString(os.urandom(32)) + except: + import random + bytes = [chr(random.randrange(256)) for i in range(32)] + self._authkey = AuthenticationString(bytes) self._tempdir = None _current_process = _MainProcess() --- Python-2.7.9/Lib/multiprocessing/connection.py.nourandom 2014-12-10 16:59:39.000000000 +0100 +++ Python-2.7.9/Lib/multiprocessing/connection.py 2015-04-20 08:21:05.113976000 +0200 @@ -412,7 +412,12 @@ def deliver_challenge(connection, authkey): import hmac assert isinstance(authkey, bytes) - message = os.urandom(MESSAGE_LENGTH) + try: + message = os.urandom(MESSAGE_LENGTH) + except: + import random + bytes = [chr(random.randrange(256)) for i in range(MESSAGE_LENGTH)] + self._authkey = AuthenticationString(bytes) connection.send_bytes(CHALLENGE + message) digest = hmac.new(authkey, message).digest() response = connection.recv_bytes(256) # reject large message