Hello and sorry for the delay ;-), I used both the installation with the installer and the patch, but I get the same error: javax.naming.CommunicationException [Root exception is java.io.InvalidClassException: org.jboss.ejb3.remoting.IsLocalInterceptor; local class incompatible: stream classdesc serialVersionUID = -3758782076801249473, local class serialVersionUID = 7152865575974097694] | It seams like an internal JBoss error. A class being retrieved by the client but having a different version id on the server... Do u know a workaround? Thanks for your help. balde ------- View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4033732#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...