While working on the smoke tests, I realized that as I was incorporating the Remoting http transport into Messaging, I didn't account for the problem of version compatibility. I moved callback handling down into the Remoting layer so that all transports could use the same code, but the result is a change in the format of message-bearing callbacks. Older clients (including the current generation on trunk) wouldn't recognize the new format. Before I re-incorporate the old code to accomodate socket transport users, I just want to verify that it is necessary. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3982565#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...