I have the JmsXARealm configuration set as specified in the JBM installation guide: | <application-policy name = "JmsXARealm"> | <authentication> | <login-module code = "org.jboss.resource.security.ConfiguredIdentityLoginModule" | flag = "required"> | <module-option name = "principal">guest</module-option> | <module-option name = "userName">guest</module-option> | <module-option name = "password">guest</module-option> | <module-option name = "managedConnectionFactoryName">jboss.jca:service=TxCM,name=JmsXA</module-option> | </login-module> | </authentication> | </application-policy> | The reported exception message does not always happen. If there were credential issues here or in the jmsdb-ds.xml file, it would fail every time I would think. I doubt it would even startup properly in that case. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4169672#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...