Russell Hires writes:

I'm playing with my firewall and I know that zope has opened a port 9673 (on a debian system it's been reset to 9673 as debian's default, rather than the zope default of 8080), but I was wondering if zope opens other ports as well. I've got two open ports, one at 8021, and the other at 3059. Zope may open a lot of ports.

See the source documentation at the top of "z2.py". Dieter