Control Center - Zenoss.Core will not start

I posted the other day about issues around accessing Control Center after deploying Zenoss Core 5.2.1 using the official .ova. Happily I resolved that issue, but I'm now faced with further pain*frown*

After following the guides I came to the point to start Zenoss.core. This fails completely - not a single one of the services starts. The serviced service is running fine.Here's some error messages I found in /var/log/messages:

Feb 20 09:41:36 core-master serviced: time="2017-02-20T09:41:36Z" level=warning msg="Could not select host" error="no authenticated hosts found" instanceid=0 location="servicestate.go:279" logger=zzk.service serviceid=d31wpnf5mik6niwdeu6u2iqmt servicename=zenperfsnmp shouldhaveaddressassignment=false
Feb 20 09:41:36 core-master serviced: time="2017-02-20T09:41:36Z" level=warning msg="Could not select host" error="no authenticated hosts found" instanceid=0 location="servicestate.go:279" logger=zzk.service serviceid=crn2ydliokyq3j9sxx4yenh9a servicename=zenprocess shouldhaveaddressassignment=false
Feb 20 09:41:36 core-master serviced: time="2017-02-20T09:41:36Z" level=warning msg="Could not select host" error="no authenticated hosts found" instanceid=0 location="servicestate.go:279" logger=zzk.service serviceid=82v2xii2dl6rj08m0nadb69v0 servicename=zentrap shouldhaveaddressassignment=true
Feb 20 09:41:36 core-master serviced: time="2017-02-20T09:41:36Z" level=warning msg="Could not select host" error="no authenticated hosts found" instanceid=0 location="servicestate.go:279" logger=zzk.service serviceid=7h2mhjcq2e4u7qj17hezgabqh servicename=MetricShipper shouldhaveaddressassignment=false

These are just constantly coming in to the log.

I'm also attaching a screenshot of my Control Center console to show the status of Zenoss.core.

The command they have listed in the documentation is missing the "--register" option. This is needed to setup authentication keys, even for the same host.