Fetching clusters failed

I have installed ECE on a single AWS EC2 instances (m5.2xlarge). I am able to create a new cluster, but once I click away from clusters in the ECE Admin console (such as clicking on Platform link), it forgets all the clusters. In fact, I have 2 clusters running with Kibana which I am able to log into, but they aren't visible in the Admin console. I get "Fetching clusters failed." This error is similiar to

It may be related that when I installed ECE, I never got the root or readonly password instead I got timed out in the logs. I pulled the password from /mnt/data/elastic/bootstrap-state/bootstrap-secrets.json instead. I just thought my timeout was set too low.

proxy.log (tail proxy.log)
[2018-08-27 18:33:12,343][WARN ][no.found.proxy.models.dns.DNSResolverActor$$anon$1] Unable to resolve host [logging-backend] due to [host not found], returning empty list. {}

zookeeper.log (less zookeeper.log | grep WARN)
2018-08-23 18:37:23,633 [myid:] - WARN [main:QuorumPeerConfig@590] - No server failure will be tolerated. You need at least 3 servers.
2018-08-23 18:37:23,724 [myid:10] - WARN [main:ContextHandler@1339] - o.e.j.s.ServletContextHandler@29ee9faa{/,null,null} contextPath ends with /*
2018-08-23 18:37:23,724 [myid:10] - WARN [main:ContextHandler@1350] - Empty contextPath
2018-08-23 19:07:41,694 [myid:10] - WARN [NIOWorkerThread-6:NIOServerCnxn@366] - Unable to read additional data from client sessionid 0xa00001a36d00001, likely client has closed socket

client-forwarder.log (less client-forwarder.log | grep WARN)
[2018-08-23 18:37:25,177][WARN ][org.apache.zookeeper.ClientCnxn] Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect {}
[2018-08-23 18:37:25,379][WARN ][no.found.clientforwarder.curator.CachingEnsembleProvider] Received empty coordinators: [Coordinators(Map())], not updating. Previously was: [Coordinators(Map( -> CoordinatorInfo(10,,,2898,3898,2191,{})))] {}

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