It looks like I solved the problem..... Both of the JBOSS Clusters jvmRoutes were set to the same routeId. Once this was changed, the systems seemed to function fine. 10:31:10,643 INFO [CacheListener] Possible concurrency problem: Replicated version id 5 matches in- | memory version for session ml5CzYIuE0X62k2vNReP4g** If you see this, check your JBOSS_HOME/server/all/deploy/jbossweb-tomcat50.sar/server.xml jvmRoute settings. Ben View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4138582#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...