I did this years ago but did not document how I did it, and unfortunately my searching hasn't come up with the answer even though I know I must have read it here (although the methodology may have changed since the time I did it).

What I need to do is add port 8080 to the list of ports Webmin listens to, and port 8008 to the ports ShellInABox listens to.  I need to do this to get around some firewall rules at my workplace.

Any suggestions?