Around 4:30 AM, I restarted the server and it went into hiding. I still don’t know exactly what happened.
Those of you with a high geek quotient may notice the server has a new IP address (IPv4 and IPv6), but otherwise the change should be transparent to you. Nothing was lost except a few hours of my life and a few hair follicles.
I figured out the root cause. We’re back to the original “server” at the original IP address