/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/primitives/constant_time.py:26: CryptographyDeprecationWarning: Support for your Python version is deprecated. The next version of cryptography will remove support. Please upgrade to a 2.7.x release that supports hmac.compare_digest as soon as possible. utils.DeprecatedIn23, Traceback (most recent call last): File "setup.py", line 44, in <module> UDPServerSocket.bind((localIP, localPort)) File "/usr/lib/python2.7/socket.py", line 224, in meth return getattr(self._sock,name)(*args) socket.error: [Errno 99] Cannot assign requested address Solución: sudo pip2 .7 install cryptography== 2.2 .2 Se encuentra en : /usr/local/lib/python2.7/dist-packages/cryptography-2.3.dist-info/INSTALLER