Hi,
you should not change different files to change port numbers.
Start original unpacked JBoss to ensure all is working at your environment.
To change the ports whitout missing some configuration you should use the port-binding manager.
See docs/examples/binding-manager/sample-bindings.xml for this.
Also these wiki might helpful for you:
http://community.jboss.org/wiki/ServiceBindingManager
http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossASTuningSliming
http://community.jboss.org/wiki/UsingJBossBehindAFirewall