Which CR2 package did you download? jboss-5.0.0.CR2.zip or jboss-5.0.0.CR2-jdk6.zip? Since you are using jdk 1.6 you need to download jboss-5.0.0.CR2-jdk6.zip. If that does not resolve the issue, what are the contents of your /etc/hosts file? Have you deployed any apps? Are you starting the 'all' or 'default' configuration? Are you running as root or as a user? The "Socket bind failed" error usually indicated a port conflict. But this is the first time I can recall seeing the "Invalid argument" detail message (it is usually reads "Address already in use"). In those cases this might help: http://wiki.jboss.org/wiki/DebugBindException Or see http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4121889 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4179235#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...