Thanks to all who replied.  The issue was, indeed, that "deb.devuan.org"
was "CNAME"d to "deb.rr.devuan.org", which apparently landed on the
".au" site at one point --- I suspect that my campus then cached that
IP, and kept using it for further attempts.

I forced "us.deb.devuan.org" in "/etc/sources/apt.list", and that solved
the problem.  I expect I could go back to the round-robin, but it's not
a priority at the moment.

-Bob

On 8/31/24 08:00, dng-request@??? wrote:
>>>>>>> On Aug 28, 2024, R A Montante, Ph.D. via Dng wrote:
>>>>>>>> Hello all,
>>>>>>>> [...]
>>>>>>>> So I tried/browsing/ to "deb.rr.devuan.org" (the CNAME) and
>>>>>>>> got this error message (I highlighted the certificate problem
>>>>>>>> in red):
>> Yes, the nginx (mis-) configuration resulted in the fallback response
>> to https requests for "undefined" subdomains of "rrq.au" to be mapped
>> as targeting "deb.rrq.au". I believe I've now got it configured better
>> by instead offering a 404 response to them prior to serving an SSL
>> certificate.
>>
>> Thanks. Ralph.
> And while that was going on, rrq helped me sort out a minor issue with
> apt-panopticon that his mirror was triggering.
>
> Thanks Ralph.
>
> All looks good now, until someones misconfiguration helps uncover some
> other bug in apt-panopticon. Not that I'm encouraging that. lol

--
R A Montante, Ph.D.
Department of Mathematics, Computer Science, and Digital Forensics
Commonwealth University - Bloomsburg University campus
--
The Tao of math: The numbers you can count are not the real numbers.