hi all from the first zookeeper server , we are trying to do ( from zookeeper session ) ls / but we got error about Client session timed out, have not heard from server in 15005ms for sessionid 0x0, closing socket connection and attempting reconnect what could be the problem here? full example from our zookeeper server machine [zk: localhost:2181(CONNECTING) 0] ls / 2018-10-16 14:03:22,585 - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1140] - Client session timed out, have not heard from server in 15005ms for sessionid 0x0, closing socket connection and attempting reconnect Exception in thread "main" org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for / at org.apache.zookeeper.KeeperException.create(KeeperException.java:99) at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1472) at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1500) at org.apache.zookeeper.ZooKeeperMain.processZKCmd(ZooKeeperMain.java:723) at org.apache.zookeeper.ZooKeeperMain.processCmd(ZooKeeperMain.java:591) at org.apache.zookeeper.ZooKeeperMain.executeLine(ZooKeeperMain.java:363) at org.apache.zookeeper.ZooKeeperMain.run(ZooKeeperMain.java:323) at org.apache.zookeeper.ZooKeeperMain.main(ZooKeeperMain.java:282) You have mail in /var/spool/mail/root ... View more