websphere控制台中node状态未知

故障环境：
WIN2003
Websphere 6.1.0.17

故障现象：
1、 Dmgr控制台中，某一节点状态显示未知，其他节点状态是正常的，这一未知节点在后台能正常启动，节点下的server情况也是如此，部署在该server上的应用也能正常访问
2、从控制台上无法操作该节点，但可以从改节点反向同步到DMGR，启动该节点会有报错(nodeagent_ffdc)  ，DMGR中只有类似于发现一未知成员的告警
3、该节点以前是好的，可能是在一次应用发布之后造成的


------Start of DE processing------ = [8/3/11 13:31:11:358 CST] , key = java.lang.NullPointerException com.ibm.ws.management.component.JMXConnectors.initDiscovery 202

Exception = java.lang.NullPointerException

Source = com.ibm.ws.management.component.JMXConnectors.initDiscovery

probeid = 202

Stack Dump = java.lang.NullPointerException

at com.ibm.ws.management.component.JMXConnectors$EndPtCollector.(JMXConnectors.java:1312)

at com.ibm.ws.management.component.JMXConnectors.initDiscovery(JMXConnectors.java:267)

at com.ibm.ws.management.component.JMXConnectors.propertyChange(JMXConnectors.java:1557)

at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:348)

at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:356)

at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:285)

at com.ibm.wsspi.runtime.component.WsComponentImpl.setState(WsComponentImpl.java:402)

at com.ibm.ws.runtime.component.ComponentImpl.setState(ComponentImpl.java:142)

at com.ibm.ws.runtime.component.ComponentImpl.setStartState(ComponentImpl.java:162)

at com.ibm.ws.runtime.component.ServerImpl.start(ServerImpl.java:540)

at com.ibm.ws.runtime.WsServerImpl.bootServerContainer(WsServerImpl.java:192)

at com.ibm.ws.runtime.WsServerImpl.start(WsServerImpl.java:140)

at com.ibm.ws.runtime.WsServerImpl.main(WsServerImpl.java:461)

at com.ibm.ws.runtime.WsServer.main(WsServer.java:59)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:618)

at com.ibm.wsspi.bootstrap.WSLauncher.launchMain(WSLauncher.java:183)

at com.ibm.wsspi.bootstrap.WSLauncher.main(WSLauncher.java:90)

at com.ibm.wsspi.bootstrap.WSLauncher.run(WSLauncher.java:72)

at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:618)

at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)

at org.eclipse.core.launcher.Main.basicRun(Main.java:280)

at org.eclipse.core.launcher.Main.run(Main.java:977)

at com.ibm.wsspi.bootstrap.WSPreLauncher.launchEclipse(WSPreLauncher.java:336)

at com.ibm.wsspi.bootstrap.WSPreLauncher.main(WSPreLauncher.java:91)