If the SLSB depends on the cluster-wide singleton (due to eg @EJB IYoursingleton ... in its implementation class) then it "becomes a cluster-wide singleton" of its own. To make this SLSB available on all nodes, remove the @EJB, and perform a HA lookup (manually, without injection) whenever you need to talk to the singleton. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4258325#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...