Nodes fail to add up and create a cluster


I setup a cluster with 3 master nodes and 5 data nodes plus a coordinating node which connects with Kibana over localhost. Now I installed xpack on every node (Including the coordinating node) and restarted the entire cluster. However I am getting the below exception:

Caused by: org.elasticsearch.transport.RemoteTransportException: [***BD2BF*01][1.11.***.***:9300][internal:transport/handshake]
Caused by: org.elasticsearch.ElasticsearchSecurityException: missing authentication token for action [internal:transport/handshake]

What is the issue here? I read about the property false will resolve the issue but that means turning x-pack off and is not helpful. Please suggest. DO I have to purchase a subscription?

What version are you on?

That's not good, see Important Configuration Changes | Elasticsearch: The Definitive Guide [2.x] | Elastic.

That was a mistake, I have 3 master nodes. I am on version 5.5.1

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