Thanks, Matt. I am somewhat relieved that you didn’t say something like “Uh, duh, you just need to fix the permissions,” so I don’t look foolish. But, really, I’m disheartened that there’s not an obvious and quick solution.
I’m 90% sure that I did an install that worked when these machines were on my home network.
I guess I’ll dust off my Well, that wasn’t it.discourse-pin-docker script and work down the list.
But, the tcpdump appears to have shed the necessary light! And now I see the typo in /etc/network/interfaces (perfectly replicated on all three servers) that was the root of the problem.
Hooray for simple (that I still don’t quite understand) networking errors!
And from there I found that I do know how to get pups to bind to a single IP.
And soon, a few people can use a server that if it catches on fire will be down until I wake up and look at my phone.
Thanks, Matt. My day is saved.
