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HBase is able to connect to ZooKeeper but the connection closes immediately

I got following error when i tried to connect hbase from hadoop nodes. Zookeeper servers runs normally but hadoop nodes can not connect remote zookeeper cluster.

ERROR: org.apache.hadoop.hbase.ZooKeeperConnectionException: HBase is able to connect to ZooKeeper but the connection closes immediately. This could be a sign that the server has too many connections (30 is the default). Consider inspecting your ZK server logs for that error and then make sure you are reusing HBaseConfiguration as often as you can. See HTable's javadoc for more information.

Then i fixed problem copying hbase-site.xml to hadoop/conf directory.

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