Yes, when exception listener callback occurs, the exception being reported is 
essentially the subject (title) of this post, that is, javax.jms.JMSException: 
Failure on underlying remoting connection.  So, I concluded that I have a 
remoting problem ... made sense to me.

I do have somewhat of an update.  Further investigation into the spurious 
exceptions related to the underlying remoting connection ultimately led me to 
the topic Unexplained ConnectionValidator Timeout  (see 
http://www.jboss.org/index.html?module=bb&op=viewtopic&t=151168 for details).  
After reading the description and noting that the topic poster was using Red 
Hat (RH) JBoss EAP 4.3.0.GA_CP03, I did the obvious … I updated from RH JBoss 
EAP 4.3.0.GA_CP02 to 4.3.0.GA_CP04 (latest/greatest non-alpha install).  Then, 
I re-ran my test.  The test ran overnight with over 150K message transfers to 
the JMS queue and over 150K from JMS queue without any random exceptions 
"heard" on the client connections.  The spurious exceptions appeared to have 
completely disappeared!

Unfortunately, I ran my test again several days later, executed roughly the 
same number of message transfers, but observed one failure.

So, it appears the problem may still be there, but has been greatly reduced.

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