I tried changing the port to 8080 using /etc/zopectl/zopectlrc (per Jamie's suggestion that I was failing because I was trying to use a privileged port), and this silently failed (I still saw the zope intro page being served on port 9673).
That's bizarre. Your packaging must be doing it strangely. Dare I suggest your do a recursive grep for that magic number to try and find where it's hidden? It'll take a while, but it really can't miss.
I apologize for only searching the last three month's of the list archive before posting. I appreciate your time and patience in responding to and educating me.
Not a problem: I mention it for purposes of research only. The list archives, I have found, can sometimes be extremely un-searchable for some reason. I have in the past not been able to find, save by browsing, messages which I know are there (because I wrote them.) Someday I'll put together a site for collecting the best information on the list. --jcc -- "My point and period will be throughly wrought, Or well or ill, as this day's battle's fought."