Well, this value is basically to protect you from never ending operations. (deadlocks) So fill in a value (in seconds) after which your longest transaction cannot possibly return a valid value. For instance: say your longest transaction takes at most 10 minutes to complete. Then, after say 15 minutes, you can be reasonably sure the transaction failed. You fill in 15*60=900 seconds. Hugo p.s. this will also mean that a transaction normally taking millisecond to complete will also only timeout after 15 minutes .... A lot can go wrong in 15 minutes. As a rule of the thub: always make your transactions as short as possible! Please check to see if you can re-design your application such that you do not need to adjust this value. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4039983#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...