"ovidiu.feodorov(a)jboss.com" What happens in the case the client buffer becomes full AND there are in-flight messages still arriving? The client may send its "slow down" asynchronous message back to the server, and after a while, the server may react to it, but what happens with the messages that have been sent during this interval? [/quote wrote : | | Any messages received from the server side when the consumer is not closed will be accepted. I.e. the max buffer size is not a hard limit. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3996483#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...