What operating system? Do you have any other servers declared within Eclipse, such as
Tomcat?
Changing the ports in the server config dialog of Eclipse will not change the ports used by JBoss AS - rather it is just a mechanism to tell Eclipse what ports it should be using to communicate with JBoss AS. You have to change JBoss AS config files to change the ports used. I would tell you what file to change but I would need to know the exact version of JBoss AS (5.0 is not sufficient).