Jorge, if you can get to your OpenACS site via "http:/localhost:8000/"
just fine but not via the external IP address, then you don't have an
OpenACS problem. You have a system or network administration problem.
Most likely, you have some firewall turned on. I don't use Red Hat
but I think recent Red Hat versions have shipped with a firewall
turned on by default.
This
has definitely been
discussed
before, although you can probably find better links than those two if
you look.