Looks like Comcast switched IP address space from 24.5.0.0/16 to 73.231.0.0/16 for my home at 3am this morning (first time for a change in over 6 years). Thanks to my security for SSH/FTP and Plesk panel access to my VPS, my weather station could no longer upload to my site, and I was locked out of doing reconfiguration. I could only access the VPS container control panel for the server.
Thanks to me screwing up the iptables, I got access to the plesk panel again and reworked the firewall with the new allowed addresses, and restarted iptables so all is good now.
Moral: make sure your security doesn't lock you out when your IP address changes.