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By default weblogic server uses multicast for cluster communication and not unicast, are you sure you have configured your clusters to communicate over unicast ? Its not clear from your problem statement.
If you are using multicast, and havent set any unique values for it for each cluster, then you will end up having some network errors caused by multicast address conflict.
when setting up several clusters in the same subnet, you should ensure that you have defined explicit listen address to each managed server in the cluster, the cluster address should be defined with no ambiguity (ie taking care of multi IP resolution). When using DNS names ensure that it resolves in a single IP only.
Unicast communication is one to one and hence the chances of messing up is rare, as long as you have configured things properly.
Hi, thanks for the reply.
Yes, I'm sure it's Unicast. I forgot to mention that I'm using 10.3 so Unicast is the default there. The docs advise to use multicast only for legacy support.
I'm afraid of misconfiguration because as I've said the two virtual machines resulted from a copy of the existing virtual machines. So it probably has
many common values etc, it's not a new installation. I'll take a look at the multi-ip resolution as I've used domain names for the cluster address though.