The default is for loadbalancing and failover to be on, addresslist is old syntax, just use DESCRIPTION. Problem Resolved - Due to Oracle bug 4338578, the public hostname was being returned to clients instead of the virtualhost name. This resulted in intermittent ORA-12545 errors. Thanks anyway. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3990505#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...