Thanks for the reply. JBoss runs in cluster mode as this issue exists in the production environment. We often have noticed that the jms queue is increasing and gets stuck, especially when there is a high load of traffic. We use JMS to send emails to our customers. We use ftp server to store the attachements. When our queue is stuck, / or when the jms msgs have increaased we restart the ftp service. When we restart the ftp service the queue gets cleared. Do you suspect anything? Please advise. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3989640#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...