Ok, Figured it out. You need to bump the port numbers for the JMX Invokers on subsequent instances. Under Apache 1.3 and mod_jk this doesn't seem to be an issue, but with Apache 2.2 and mod_proxy / mod_proxy_ajp this causes a problem. See changes to jboss-service.xml below for an example. -Bob <!-- ==================================================================== --> <!-- Invokers to the JMX node --> <!-- ==================================================================== --> <!-- RMI/JRMP invoker --> 44464447 <-- Was 4444 --> ${jboss.bind.address} <!-- custom custom custom ssl-domain-name --> jboss:service=TransactionManager jboss:service=TransactionManager 1 300 300 60000 ${jboss.bind.address} 4447 <-- Was 4445 --> ${jboss.bind.address} 0 false <depends optional-attribute-name="TransactionManagerService">jboss:service=TransactionManager View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4216672#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...