Hi all, I would like to know if Orion supports server federation. In principle I would consider two models: Centralized Federation: All servers use the same Naming service.Authentication and authorization is thus centralized against this service. It is then straightforward to propagate security information between components and stablish security domains --for example between EJB in server A and EJB in server B--. In this case the MOM services (JMS) are also centralized in the unique directory. Distributed federation: Each server has its own directory service but it is bind to other directory service (JNDI federation or LDAP REFERRALS). In this case it is also possible to stablish security domains between components but , the Authorization module in server X should then follow the referral or bind to the remote directory service to look up user information. The security propagation is also guaranteed. I have seen that rmi.xml you can include references to other servers but I am not sure if this is more aimed for clustering. Do you have any information concerning this point ? Regards,