jaikiran pai [http://community.jboss.org/people/jaikiran] replied to the discussion "Upgrading JBoss 4.0 to 5.1 - application won't connect" To view the discussion, visit: http://community.jboss.org/message/553150#553150 -------------------------------------------------------------- Are you packaging any JBoss specific jar files in your application (like some jar containing org.jboss.system.* classes)? If yes, remove them from the application packaging. How exactly do you start the server? What command do you use? And how do you try to "connect"? Using a browser or some other means? -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/553150#553150] Start a new discussion in Beginner's Corner at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]