Thanks for the feedback on Clustering and Load Balancing article.
Can you e-mail me the error message you are getting when using ServerUtil class. I have the configuration working on my home PC and am curious to see what kind of error message the load balance is throwing in your configuration.
Also, regarding URL redirecting it should work by redirecting the Http request to the available cluster member (this is a simple forward to the new URL). This should work with any URL (internal server or external). Let me know what's the server configuration you are using in your web application.