Opscenter 6.0代理超时。提示多次重新安装

Question

通过Opscenter Ubuntu 14.10 LTS上的apt升级到最新的DSE Opscenter 6.0。干净安装后，3-dc / 6节点DSE 4.8群集中的3-4个代理报告问题如图所示。

节点上的代理日志显示如下问题：

 INFO [async-dispatch-22] 2016-07-13 22:38:46,208 Starting monitored database connection.
 ERROR [async-dispatch-22] 2016-07-13 22:39:00,566 Can't connect to Cassandra (All host(s) tried for query failed (tried: /172.30.0.217:9042 (com.datastax.driver.core.exceptions.OperationTimedOutException: [/172.30.0.217] Operation timed out))), retrying soon.
  INFO [async-dispatch-22] 2016-07-13 22:39:00,570 Starting JMXComponent
 ERROR [async-dispatch-22] 2016-07-13 22:40:00,631 Error starting JMXComponent
 java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.CommunicationException [Root exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
        java.net.SocketTimeoutException: Read timed out]
        at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:369)
        at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:249)
        at opsagent.jmx$create_jmx_pool_with_config$wrapper__11498.doInvoke(jmx.clj:216)
        at clojure.lang.RestFn.invoke(RestFn.java:439)
        at opsagent.jmx.JMXComponent.start(jmx.clj:320)
        at com.stuartsierra.component$fn__8837$G__8831__8839.invoke(component.clj:4)
        at com.stuartsierra.component$fn__8837$G__8830__8842.invoke(component.clj:4)
        ........

OR

INFO [async-dispatch-22] 2016-07-13 22:40:00,635 Starting JMXComponent
 ERROR [async-dispatch-22] 2016-07-13 22:41:00,676 Error starting JMXComponent
 java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.CommunicationException [Root exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
        java.net.SocketTimeoutException: Read timed out]
        at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:369)
        at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:249)
        at opsagent.jmx$create_jmx_pool_with_config$wrapper__11498.doInvoke(jmx.clj:216)
        at clojure.lang.RestFn.invoke(RestFn.java:439)
        at opsagent.jmx.JMXComponent.start(jmx.clj:320)
        at com.stuartsierra.component$fn__8837$G__8831__8839.invoke(component.clj:4)
        at com.stuartsierra.component$fn__8837$G__8830__8842.invoke(component.clj:4)
        at clojure.lang.Var.invoke(Var.java:379)
        at clojure.lang.AFn.applyToHelper(AFn.java:154)

这是在同一个DSE 4.8群集上运行前一个Opscenter 2年而没有任何问题的群集。我们非常感谢您对此进行故障排除。