I’ve contacted my ISP with a generic question about Plex, to see if they mention any recent changes.
I’ve also spotted this other forum post with a similar issue, although their symptoms started at least a few days earlier than mine: Can not claim server suddenly after having no problem for over a year - Plex Media Server - Plex Forum
I’ve also tried downgrading to 1.41.6.9685-d301f511a
, but that didn’t help.
I’m also in the process of exploring setting up a fresh new plex container adjacent to the existing one, but I’m having trouble claiming that one too, getting the same or similar SSL errors.