Using JBoss and Amazon's EC2 service ? Hugo Troche makes a post addressing the limitations of deploying clusters in EC2, given the multicasting limitations imposed the EC2 network, and illustrates a workaround to the problem. Read Hugo Troche's post on Clustering JBoss in the Amazon's EC2 service. http://www.hugotroche.com/my_weblog/2008/06/clustering-jbos.html