Launch OpenStack instance with network error

Issue

• The following error is observed when attempting to launch new instances:

Build of instance <uuid> aborted: Failed to allocate the network(s), not rescheduling

• Message seen in nova-api.log:

 _http_log_response /usr/lib/python2.7/site-packages/keystoneclient/session.py:224
2016-07-07 15:58:32.192 8761 DEBUG nova.policy [req-<id> - - -] Policy check for compute_extension:hide_server_addresses failed with credentials {'domain': None, 'project_name': u'admin', 'project_domain': None, 'timestamp': '2016-07-07T15:58:32.052214', 'remote_address': '<ip>', 'quota_class': None, 'resource_uuid': None, 'is_admin': True, 'user': u'<uid>', 'service_catalog': [{u'endpoints': [{u'adminURL': u'https://<controller>:8776/v2/<uuid>', u'region': u'RegionOne', u'internalURL': u'https://<controller>:8776/v2/<uuid>', u'publicURL': u'https://<controller>:8776/v2/<uuid>'}], u'type': u'volume', u'name': u'cinder'}, {u'endpoints': [{u'adminURL': u'https://<controller>:8776/v2/<uuid>', u'region': u'RegionOne', u'internalURL': u'https://<controller>:8776/v2/<uuid>', u'publicURL': u'https://<controller>:8776/v2/<uuid>'}], u'type': u'volumev2', u'name': u'cinderv2'}], 'tenant': u'<uuid>', 'read_only': False, 'project_id': u'<uuid>', 'user_id': u'<uuid>', 'show_deleted': False, 'roles': [u'admin'], 'user_identity': '<uuid> <uuid> - - -', 'read_deleted': 'no', 'request_id': 'req-<id>', 'instance_lock_checked': False, 'user_domain': None, 'user_name': u'admin'} enforce /usr/lib/python2.7/site-packages/nova/policy.py:104
2016-07-07 15:58:32.204 8761 INFO nova.osapi_compute.wsgi.server [req-<id> - - -] <ip> "GET /v2/<uuid>/servers/<uuid> HTTP/1.1" status: 200 len: 2167 time: 0.1540461
2016-07-07 15:58:32.210 8761 DEBUG nova.api.openstack.wsgi [req-<id> - - -] Calling method '<bound method Controller.delete of <nova.api.openstack.compute.servers.Controller object at 0x3a2ea50>>' _process_stack /usr/lib/python2.7/site-packages/nova/api/openstack/wsgi.py:783