thank your for your reply, ron. "ron.sigal(a)jboss.com" wrote : I'm concerned, though, that the same solution didn't work for Remoting 2.4. Did you just give up on 2.4, or is there anything else you can tell me about your experiments with 2.4? well, as far as i can remember... i just didnt update the jbossall-client.jar with JBoss Remoting 2.4. thus my server and client didnt use the same version of Remoting which led to the exception(s) shown in my previous posts, of course. i think the solution should work with JBoss Remoting 2.4, too (update server and(!) client libraries). but i just tried to change as less as possible... so i chose Remoting 2.2.2 SP8 O: ) thank you very much for your explanations concerning EJB 2.1. it seems to be not too complicated to me. but i will not try this out anyway, because we are going to migrate all of our EJBs from 2.1 to 3.0 in the next months. so compression is one more reason (of small importance) pro migration ; ) regards robert View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4177023#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...