Hi Peter, thank you. I have been trouble shooting with a colleague from the lead you gave me and apparently JBoss needs to check that the system's hostname is locally resolvable... http://www.tortoiseandachilles.com/2007/09/clustering-jboss-42-on-ubuntu-... (Solving the 'Caused by: java.lang.RuntimeException: Exception creating identity' Error section) The problem is that the hostname for my machine is not being resolve, so I have been advised to contact the system administrators to rectify the issue. I'll let you know how it goes. Thanks once again. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4124444#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...