Alright, I need to step away to do actual work that pays the bill at this point, but wanted to drop what I found here before doing so.
- Summit seems to be 403-ing for piefed.social. However, I was able to log in to other piefed sites (feddit.online, piefed.ca, my dev instance) with Summit, so it's probably just piefed.social I guess?
- I tried both Boost and Voyager and they were both able to log into piefed.social.
- I was able to confirm that Summit wouldn't trip any of the user-agent related filtering in the codebase (to try to keep scrapers out of certain things).
My guess at this point is that there might be something wonky going on at the infrastructure/WAF-level. If so, then this status quo is going to stick around until @rimu@piefed.social can dive into it. My sysadmin skills are not the best when it comes to this kind of thing.