Try increasing ucast_recv_buf_size and mcast_recv_buf_size to more than 10MB. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4031151#4031151 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4031151