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I ran into the same issue on a 3 node (controller, network, compute) icehouse install on physical servers. In my case, the neturon error logs displayed "ERROR neutron.notifiers.nova Failed to notify nova on events: ['status':'completed', 'name':''network-vif-unplugged', 'server_uuid':'u'f4a..']" The above was due to a configuration error in the neutron.conf file in my controller node. My entry for the field "nova_url" was "http://10.0.0.35:8774/v2/v2" instead of "http://10.0.0.35:8774/v2". Took me a couple of days over the weekend to figure this out.