This is my setup. I am building a 4 node cluster. I have tried jboss 4.03 and 
4.03sp1. The machines are windows 2003 servers and the jvm is java 5. 
Everything has been updated. I am using the default cluster-service.xml. All 
the machines are on the same network segment, no firewalls are in place. The 
machines can all see ( ping) one another.

The problem I am having is that the nodes are not discovering each other. 
Sometimes, three of the nodes form a group but this process takes a while. The 
4th node never gets detected. The network settings of the machines are 
identical. I have tried using ViewDemo - the results are the same. I have setup 
multicast receiver/sender pairs and the reception is sporadic. I have run  the 
Draw demo and I do not get any communication between the instances.

To add insult to injury, I have setup a similar cluster for another company 
which worked 'out of the box'. I am not a network engineer so I have no idea 
what i can troubleshoot to fix this problem. Likewise, the network engineer 
knows nothing about jboss clustering so doesn't know what settings to check.

Can anyone offer some advice of what i can do to help troubleshoot this issue. 
I am logging all of jgroups at trace level but I am not seeing anything that 
looks like a problem. What network settings should I get the network engineer 
to examine that would affect the multicast traffic between the machines?

thank you

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