Comment 0 for bug 1580817

==> /var/log/maas/rackd.log <==
2016-05-12 08:00:22+0800 [ClusterClient,client] ClusterClient connection lost (HOST:IPv4Address(TCP, '192.168.20.104', 57846) PEER:IPv4Address(T
CP, '192.168.20.104', 5252))
2016-05-12 08:00:22+0800 [ClusterClient,client] Querying node power states.
        Traceback (most recent call last):
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 434, in errback
            self._startRunCallbacks(fail)
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 501, in _startRunCallbacks
            self._runCallbacks()
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 588, in _runCallbacks
            current.result = callback(current.result, *args, **kw)
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 1184, in gotResult
            _inlineCallbacks(r, g, deferred)
        --- <exception caught here> ---
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 1126, in _inlineCallbacks
            result = result.throwExceptionIntoGenerator(g)
          File "/usr/lib/python3/dist-packages/twisted/python/failure.py", line 389, in throwExceptionIntoGenerator
            return g.throw(self.type, self.value, self.tb)
          File "/usr/lib/python3/dist-packages/provisioningserver/pserv_services/node_power_monitor_service.py", line 64, in query_nodes
            ListNodePowerParameters, uuid=client.localIdent)
        twisted.internet.error.ConnectionDone: Connection was closed cleanly.

==> /var/log/maas/maas.log <==
May 12 08:00:22 trusty-maas9 maas.power_monitor_service: [ERROR] Failed to query nodes' power status: Connection was closed cleanly.