Hi Dave,
Thanks for your reply. I’m feeling a little dumb, but I finally found the cause of my issue. I had curl_exec() function disabled in my fpm php.ini file. I must have made that change at least half a year ago, trying to secure the php process, and just never noticed that it had an adverse effect on the firewall till today. Sorry to bother you with my ignorance. Should have combed the errorlog a little closer before posting!