Java node client failing to send join request to master

Elastic Stack Elasticsearch
1

Anyone have any idea where to start with this one? We're running our
singular master/data node in a docker container, trying to connect via a
Java node client on different boxes. Please help!!

INFO [2015-02-20 02:55:11,411] org.elasticsearch.discovery.ec2:
[localhost] failed to send join request to master
[[esNode][jU4Y42dtQfCPJn1-5jFfYw][esHost][inet[/255.255.255.255]]{master=true}],
reason
[RemoteTransportException[[esNode][inet[/255.255.255.255:9300]][internal:discovery/zen/join]];
nested:
NotSerializableTransportException[[org.elasticsearch.transport.ConnectTransportException]
[localhost][inet[/255.255.255.255:9300]] connect_timeout[30s]; connection
timed out: /255.255.255.255:9300; ]; ]

elasticsearch.yml:

cloud:

aws:

access_key: awsAccessKey

secret_key: awsSecretKey

region: us-west-2

discovery:

type: ec2

ec2:

groups: elasticsearch

availability_zones: us-west-2a

tag:

  Elasticsearch: tag

network.public_host: 255.255.255.255

network.publish_host: 255.255.255.255

discovery.zen.ping.multicast.enabled: false

Java node client:

Settings settings = ImmutableSettings.settingsBuilder()
.put("node.name", nodeName)
.put("cloud.aws.access_key", awsAccessKey)
.put("cloud.aws.secret_key", awsSecretKey)
.put("cloud.aws.region", "us-west-2")
.put("cloud.node.auto_attributes", true)
.put("discovery.type", "ec2")
.put("discovery.ec2.groups", "elasticsearch")
.put("discovery.ec2.availability_zones", "us-west-2a")
.put("discovery.ec2.tag.Elasticsearch", "devvpc")
.put("discovery.zen.ping.multicast.enabled", false)
.build();
this.node = nodeBuilder()
.clusterName(clusterName)
.settings(settings)
.client(true)
.node();
this.client = node.client();

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