Hi Clebert, Thanks for your reply. Unfortunately, the stack trace I've already posted is all I have. There are no nested or linked exceptions. I looked at the exception in the debugger and found only nulls. Anything I can do to provide more information (e.g. raise the logging level)? One further thought: We are using the Binding Service to map the ports. This has already caused another problem with the upgrade to Messaging 1.0.1.SP2 (see http://www.jboss.org/index.html?module=bb&op=viewtopic&t=98390 ). Might this also be related in this case? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4000723#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...