Java ElasticSearch None of the configured nodes are available

Elasticsearch settings are in $ES_HOME/config/elasticsearch.yml. There, if the cluster.name setting is commented out, it means ES would take just about any cluster name. So, in your code, the cluster.name as "elastictest" might be the problem. Try this:

Client client = new TransportClient()                .addTransportAddress(new InetSocketTransportAddress(                        "143.79.236.xxx",                        9300));

possible problem:

1. wrong port, if you use a Java or Scala client, correct port is 9300, not 9200
2. wrong cluster name, make sure the cluster name you set in your code is the same as the cluster.name you set in $ES_HOME/config/elasticsearch.yml
3. the sniff option, set client.transport.sniff to be true but can't connect to all nodes of ES cluster will cause this problem too. ES doc here explained why.

You should check the node's port, you could do it using head.These ports are not same. Example,

The web URL you can open is localhost:9200,but the node's port is 9300, so none of the configured nodes are available if you use the 9200 as the port.