Tip: Elasticsearch OSX ConnectException

If you downloaded the latest Elasticsearch installation and you are getting the following exception:

org.elasticsearch.common.netty.channel.ConnectTimeoutException: connection timed out:/xyz.def.zzzz:9300
at org.elasticsearch.common.netty.channel.socket.nio.NioClientBoss.processConnectTimeout(NioClientBoss.java:139)
at org.elasticsearch.common.netty.channel.socket.nio.NioClientBoss.process(NioClientBoss.java:83)
at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337)
at org.elasticsearch.common.netty.channel.socket.nio.NioClientBoss.run(NioClientBoss.java:42)
at org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
at org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)

Solution

go to config/elasticsearch.yml

Uncomment the following line
discovery.zen.ping.multicast.enabled: false

Restart Elasticsearch