hello, I developed an EJB3 application with JBOSS 4.0.5 GA (using the PATCH of EJB3) The application works correctly in a post "A" The same application, Installed in a post "B", produce these exceptions : Exception in thread "main" java.lang.reflect.UndeclaredThrowableException at $Proxy0.getSessions(Unknown Source) at TestEJB.main(TestEJB.java:95) Caused by: java.rmi.MarshalException: Failed to communicate. Problem during marshalling/unmarshalling .... I tried to test the Client A with the Server B usong a remote EJB access: It works correctly. Than, the same error was reproduced in several posts. I found difficulties to localyse the problem. Thank you for your help. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4152920#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...