Clustering in tomcat

[kashif_tomcat <ka...@vopium.com>]

can anyone help me for clustering in tomcat.

here is scenario:

two tomcat servers running on same linux machine on different ports with
apache installed on front side as web server and using mode proxy ajp for
integration with tomcat. now i uncommented following tag in server.xml of
tomcat conf to enable clustering. 

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>

when i start tomcat server i get following exception:

INFO: Done sleeping, membership established, start level:4
Oct 21, 2008 3:04:38 PM org.apache.catalina.ha.tcp.SimpleTcpCluster start
SEVERE: Unable to start cluster.
org.apache.catalina.tribes.ChannelException: java.io.IOException: Operation
not permitted; No faulty members identified.
	at
org.apache.catalina.tribes.group.ChannelCoordinator.internalStart(ChannelCoordinator.java:169)
	at
org.apache.catalina.tribes.group.ChannelCoordinator.start(ChannelCoordinator.java:97)
	at
org.apache.catalina.tribes.group.ChannelInterceptorBase.start(ChannelInterceptorBase.java:149)
)


can anyone tell me 


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