Hi all ! Yes! And it's wrong (I read some documents today). The main problem is inside my jboss.xml, all things not effect (and DatabaseServerLoginModule not effect). JBoss server and mySql installed on the same machine (ex: hostname is "violon"), on the other machine (ex: hostname is "abc"). And on the "abc", I write the client app to transfer username and password to server. (I deployed my bean on "violon"). Please guide to me ! Thanks. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4013381#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...