JMS is not clustering correctly anymore

Hi all,
          I'm knee deep in a problem that has completely perplexed me. We have a
          cluster of two managed servers ms1, ms2 they are clustered together.
          They run on separate machines. We also have two JMS servers
          JMSServer1, and JMSServer2. JMSServer1 runs on ms1, JMSServer2 runs on
          ms2. We have a distributed queue with physical queue members that
          belong on both JMSServer1 and JMSServer2, our client application
          creates temporary topics, attaches itself as a listener to each temp
          topic it creates, then fires off a message to the distributed queue,
          with the message's JMSReplyTo field set to the temp topic that was
          created. A MDB reads the message off of the dist queue and then fires
          messages to the temp topic referenced in the JMSReplyTo field. Our
          configuration used to work great such that each temp topic that got
          created round robined between each JMSServer (JMSServer1, and
          JMSServer2), and which ever MDB was servicing the message from the
          queue had no problem locating and then sending the response messages to
          the appropriate temp topic whether the temp topic so happened to be
          located on the same managed server as the MDB or not.
          But then I was forced to dismantle the cluster, and had to make a whole
          bunch of changes. Later I went back to my cluster configuration, and
          at the same time our networking folks made a whole bunch of changes to
          the machines that the managed servers run on. So I had to adjust ip
          addresses and host names, and thought I got everything back together
          again, however now when the client creates each temp topic they are all
          created on the same managed server/JMSServer they are no longer round
          robined (i.e ms2) Also the MDB that services the message is always on
          the opposite mangaged server (i.e ms1), and when it tries to send its
          response messages to the temp topic I now get Destination not found
          errors, and when I look deeper in the stack trace weblogic reports that
          it can't do a JNDI lookup on weblogic.jms.S:<name of managed server>
          So I went and verified my cluster configuration is the same as it used
          to be except for IP addresses and it is... Also I went and looked at
          the JNDI tree for each managed server, and I noticed that for ms1 there
          is an entry of weblogic.jms.S:ms1, and for ms2 there is a JNDI entry of
          weblogic.jms.S:ms2, so the problem is the MDB that is servicing the
          message needs to get to the other managed server but it cannot find
          it...which makes sense because it is not listed in the JNDI tree. But
          why is not listed in the JNDI tree??? I went and looked at a cluster
          we have running in development and noticed that for ms1 I have JNDI
          entries of both weblogic.jms.S:ms1 AND weblogic.jms:Sms2, and the same
          for when I look at the JNDI entries of ms2. So I've also tried
          creating a brand new cluster from scratch with brand managed servers on
          dev, and everytime I add the managed servers to the cluster and view
          the JNDI tree for each managed server I see both managed servers
          listed. This seems correct, and things work fine in dev! For our test
          env I only see one weblogic.jms.S:<managed server> entry per managed
          server! I have no idea why this occurs. I see no errors in the
          managed server logs or admin logs when starting the cluster. I've run
          the multicast tool and multicast reports things are working correctly.
          The test cluster from a setup and startup standpoint acts like it is
          clustered correctly but when I try to attach a client now it acts as if
          its not clustered correctly WEIRD!?
          I'm assuming that whenver you create a new cluster that for each
          managed server that is part of the cluster all managed servers should
          be listed (weblogic.jms:Sms1, weblogic.jms.S:ms2,etc) for each JNDI
          tree on every managed server correct? What could cause this NOT to
          happen. Should I reinstall weblogic, I've tried creating new clusters,
          brand new domains and everytime now I can never get the managed servers
          JNDI trees to listed the other managed server!
          This is weblogic 8.1 sp3 BTW
          Please Help!

I don't think a re-install is in order. Usually, the first thing to check is if multicast is working on your network. You can use the following stand-alone utility:
          http://e-docs.bea.com/wls/docs81/admin_ref/utils25.html
          For further advice, you can try the "clustering" newsgroup.
          Tom

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