By default for http the web browser will try to connect to port 80 unless you specify something different.
When you were running JBoss 3.0.6 did you or anyone else change the listener port for the servlet container to listen on port 80?
Anyway that is the change that needs to be made to get the same behaviour that you had before.
you can change the port in
open it,then you can find this.
<!-- A HTTP/1.1 Connector on port 8080 -->
then you kown how to do it.