I have been working with the O'Reilly book and JBoss 3.0 beta workbook for some time now and want to let the rest of you know about a few items I have figured out. From the start I have been using two RedHat 8.0 boxes, one for the JBoss server and one for running the client app.

First off, multicasting does not work if the server is run in "default" mode. Multicasting does work if the server is run in "all" mode.

Second, setting up jndi.properties with an entry:
java.naming.provider.url=jnp://server:1099/
does not work because it gets stepped on by
java.naming.provider.url=jnp://localhost:1099
in a jndi.properties file buried in JBoss-3.0.X/client/jbossjmx-ant.jar

Hope this help those of you who are also using two machines.