https://community.cloudera.com/t5/Support-Questions/Hbase-region-servers-not-able-to-connect-to-master-after/m-p/198705#M160753 <P>It sounds like there is no network issue between Master and RegionServer, so you would need to look at the HBase level instead. The error message you provided is only telling you that the Master has seen no RegionServers, but you already knew that because the error message in your question showed that the RegionServer failed to report to the Master. You need to figure out why this report is failing -- perhaps you should look at the DEBUG level logs.</P> Mon, 17 Apr 2017 21:33:52 GMT elserj 2017-04-17T21:33:52Z