"cburnley" wrote : which would imply that it is not really a 2.1 view of the service because it uses ejb3 proxy classes No, it's a valid EJB 2.1 View, but the ICE is because the 4.2.3 and 4.0.3 Proxy classes are not compatible. Solution is to ensure that your client has the correct classes on its ClassPath. FYI, in AS5 @Remote does not accept EJB 2.1 interfaces (ie. extends EJBObject), but the Remote Component Interface metadata is read in from the return values of "create" methods in @RemoteHome. S, ALR View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4192286#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...