IPlanet Plug-in does not recognize all cluster members

          We are running 7 WLS 6.1 SP2 server instances on two Solaris 2.8 machines. (3 on
          machine A , 4 on machine B). The admin server is also running on Machine A.
          All the cluster members appear to join the cluster correctly on startup, at least
          as far as the WLS console shows. No logged errors.
          We are using the IPlanet 6.0, sp4 with the Weblogic NSAPI plug-in to load-balance
          across the cluster.
          However the Plug-in will only recognize the server instances on machine A or machine
          B during any one life of the IPlanet. We can never get the plug-in to recognize
          all instances at one time, only on one machine or the other. We can see this from
          the results of a __WebLogicBridgeConfig.
          Using same configuration WLS configuration, run where machine A and B are domains
          on the same physical machine uses both A and B servers.
          We suspect this has to do with a multicast problem, running MulticastTest between
          machines A and B fail to receive messages.
          My questions are,
          A) Why would we be seeing all server instances as having successfully joined the
          cluster, if multicast is failing?
          B) How would multicast have any effect on how the NSAPI plug-in sees the cluster
          members?
          C) Why would the cluster instances seen by the NSAPI plug-in alternate between
          machine only A or B, after each shutdown and start-up ?
          WLS 6.1 SP2 on Solaris 2.8, IPlanet 6.0 sp4.
          

I am seeing a similar problem. I have three machines - each with four managed servers running on them. All 12 servers in the cluster are are specified in the obj.conf for NSAPI. Only eight of the servers get used, however. The wierd part is that machine1 contains managed servers 1, 4, 7, and 10. Machine 2 contains managed servers 2, 5, 8, and 11. Machine 3 contains managed servers 3, 6, 9, and 12. In the obj.conf, we list the machines in ourder 1 to 12 for the cluster. For some reason the NSAPI is skipping managed servers 3, 6, 9, and 12. I have checked both the connectivity for the ip and the port. The fire wall seems fine.
          Did you ever get a response or figure out what was causing this problem.
          Thanks,
          Mark

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