Do you mean you are using EAP 4.3? Or JBoss 4.2.3? If it's EAP 4.3 and you have a support contract, I recommend you open a support ticket on the Customer Service Portal, where there's an SLA. In your other environment where you aren't seeing the asterisks, the webapp must not have the <distributable/> element in web.xml. I suspect the problem you are seeing is an issue in the JvmRouteValve, which is responsible for changing the session cookie when it detects a failover has occurred. There have been a number of changes in this valve, so before I start chasing this please confirm exactly what version you are using. This gets logged in the server.log at the end of startup, e.g. anonymous wrote : 11:36:23,621 INFO [Server] JBoss (MX MicroKernel) [4.3.0.GA_CP03 (build: SVNTag=JBPAPP_4_3_0_GA_CP03 date=200904141024)] Started in 1s:210ms Also, please confirm, when you wrote anonymous wrote : of the kind ".jvmRoute.jvmRoute" you meant, for example .node1.node2.node1.node2 Ideally please paste an example of a healthy JSESSIONID (i.e. before problem happens) and a broken one. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4240106#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...