集群启动成功，查看状态失败，请问是怎么回事？

 [root@Jackson /]# zkServer.sh start
 ZooKeeper JMX enabled by default
 Using config: /opt/programs/zookeeper-3.4.12/bin/../conf/zoo.cfg
 Starting zookeeper ... STARTED
 [root@Jackson /]# zkServer.sh status
 ZooKeeper JMX enabled by default
 Using config: /opt/programs/zookeeper-3.4.12/bin/../conf/zoo.cfg
 Error contacting service. It is probably not running.