ERROR: test_python_builders (test.test_xmlrpc_net.PythonBuildersTest)
Step #0: ----------------------------------------------------------------------
Step #0: Traceback (most recent call last):
Step #0:   File "/opt/sources/Python-3.5.4/Lib/test/test_xmlrpc_net.py", line 17, in test_python_builders
Step #0:     builders = server.getAllBuilders()
Step #0:   File "/opt/sources/Python-3.5.4/Lib/xmlrpc/client.py", line 1092, in __call__
Step #0:     return self.__send(self.__name, args)
Step #0:   File "/opt/sources/Python-3.5.4/Lib/xmlrpc/client.py", line 1432, in __request
Step #0:     verbose=self.__verbose
Step #0:   File "/opt/sources/Python-3.5.4/Lib/xmlrpc/client.py", line 1134, in request
Step #0:     return self.single_request(host, handler, request_body, verbose)
Step #0:   File "/opt/sources/Python-3.5.4/Lib/xmlrpc/client.py", line 1167, in single_request
Step #0:     dict(resp.getheaders())
Step #0: xmlrpc.client.ProtocolError: <ProtocolError for buildbot.python.org/all/xmlrpc/: 503 Service Unavailable>