We are still running an old version of Clouder, v 5.15.0 (almost at the end of work upgrading) and a few hours ago users reported queries in Hue were not running. CM reported a number of issues so we decided to restart the entire cluster.   Zookeeper will not start, the error seen is below. There is a timeout issue that we've not been able to solve. There were no changes made at the time.    7:49:47.620 AM INFO QuorumPeerConfig Reading configuration from: /run/cloudera-scm-agent/process/20394-zookeeper-server/zoo.cfg 7:49:47.631 AM INFO QuorumPeerConfig Defaulting to majority quorums 7:49:47.634 AM INFO DatadirCleanupManager autopurge.snapRetainCount set to 3 7:49:47.634 AM INFO DatadirCleanupManager autopurge.purgeInterval set to 24 7:49:47.635 AM INFO DatadirCleanupManager Purge task started. 7:49:47.643 AM INFO DatadirCleanupManager Purge task completed. 7:49:47.646 AM INFO QuorumPeerMain Starting quorum peer 7:49:50.747 AM ERROR QuorumPeerMain Unexpected exception, exiting abnormally java.io.IOException: Could not configure server because SASL configuration did not allow the ZooKeeper server to authenticate itself properly: javax.security.auth.login.LoginException: connect timed out at org.apache.zookeeper.server.ServerCnxnFactory.configureSaslLogin(ServerCnxnFactory.java:207) at org.apache.zookeeper.server.NIOServerCnxnFactory.configure(NIOServerCnxnFactory.java:87) at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:135) at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:116) at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:79)   Hoping someone will have an idea we can try. ... View more