java.rmi.ConnectException: Destination unreachable

Hi
We are using weblogic 10,

admin server having one cluster that cluster having two  manage server,

all the applications are deployed in Manager server not in admin server, 

We are working for load balancing and failover. For failover it's not working.
If a managed server down then the failover not working and we get error as

nested exception is: java.rmi.ConnectException: Destination unreachable; nested
exception is:
    java.net.ConnectException: Connection refused: connect; No available router
to destination
javax.ejb.EJBException: nested exception is: java.rmi.ConnectException:
Destination unreachable; nested exception is:
    java.net.ConnectException: Connection refused: connect; No available router
to destination
java.rmi.ConnectException: Destination unreachable; nested exception is:
    java.net.ConnectException: Connection refused: connect; No available router
to destination
    at weblogic.rjvm.ConnectionManager.bootstrap(ConnectionManager.java:472)
    at weblogic.rjvm.ConnectionManager.bootstrap(ConnectionManager.java:404)
    at weblogic.rjvm.RJVMImpl.ensureConnectionEstablished(RJVMImpl.java:297)
    at weblogic.rjvm.RJVMImpl.getOutputStream(RJVMImpl.java:341)
    at weblogic.rjvm.RJVMImpl.getRequestStreamInternal(RJVMImpl.java:595)
    at weblogic.rjvm.RJVMImpl.getRequestStream(RJVMImpl.java:547)
    at weblogic.rjvm.RJVMImpl.getOutboundRequest(RJVMImpl.java:767)
    at
weblogic.rmi.internal.BasicRemoteRef.getOutboundRequest(BasicRemoteRef.java:160)

    at weblogic.rmi.internal.BasicRemoteRef.invoke(BasicRemoteRef.java:212)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.jav
a:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at
weblogic.ejb.container.internal.RemoteBusinessIntfProxy.invoke(RemoteBusinessInt
fProxy.java:63)
    at $Proxy12.getAllAdminDomains(Unknown Source)
    at javax.swing.JTree.fireValueChanged(JTree.java:2823)
    at javax.swing.JTree$TreeSelectionRedirector.valueChanged(JTree.java:3194)
    at
javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelection
Model.java:629)
    at
javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelection
Model.java:1078)
    at
javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(DefaultTreeSelectio
nModel.java:287)
    at
javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(DefaultTreeSelection
Model.java:170)
    at javax.swing.JTree.setSelectionPath(JTree.java:1598)
    at
javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(BasicTreeUI.java:2316)
    at
javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3517
)
    at
javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3456)
    at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:263)
    at java.awt.Component.processMouseEvent(Component.java:6035)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
    at java.awt.Component.processEvent(Component.java:5803)
    at java.awt.Container.processEvent(Container.java:2058)
    at java.awt.Component.dispatchEventImpl(Component.java:4410)
    at java.awt.Container.dispatchEventImpl(Container.java:2116)
    at java.awt.Component.dispatchEvent(Component.java:4240)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3983)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
    at java.awt.Container.dispatchEventImpl(Container.java:2102)
    at java.awt.Window.dispatchEventImpl(Window.java:2429)
    at java.awt.Component.dispatchEvent(Component.java:4240)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
    at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273
)
    at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
    at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:177)
    at java.awt.Dialog$1.run(Dialog.java:1039)
    at java.awt.Dialog$3.run(Dialog.java:1091)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.awt.Dialog.show(Dialog.java:1089)
    at java.awt.Component.show(Component.java:1419)
    at java.awt.Component.setVisible(Component.java:1372)
    at java.awt.Window.setVisible(Window.java:801)
    at java.awt.Dialog.setVisible(Dialog.java:979)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.jav
a:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at
org.jdesktop.application.ApplicationAction.noProxyActionPerformed(ApplicationAct
ion.java:662)
    at
org.jdesktop.application.ApplicationAction.actionPerformed(ApplicationAction.jav
a:698)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
    at
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
    at
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
    at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
    at
javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1216)
    at
javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.jav
a:1257)
    at java.awt.Component.processMouseEvent(Component.java:6038)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
    at java.awt.Component.processEvent(Component.java:5803)
    at java.awt.Container.processEvent(Container.java:2058)
    at java.awt.Component.dispatchEventImpl(Component.java:4410)
    at java.awt.Container.dispatchEventImpl(Container.java:2116)
    at java.awt.Component.dispatchEvent(Component.java:4240)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
    at java.awt.Container.dispatchEventImpl(Container.java:2102)
    at java.awt.Window.dispatchEventImpl(Window.java:2429)
    at java.awt.Component.dispatchEvent(Component.java:4240)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
    at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273
)
    at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
    at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173
)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)



please give your suggestion.

Thanks
Prakash.G