ahhhh it appears nothing is federating. Sorry @amin hasn't been checking fedi the last couple days.

We're looking into it, updates to come.

https://status.polymaths.social/issues/federation-interruption-2024-05-13/

Federation Interruption | Polymaths.social Status

Nothing appears to be federating to other servers. Investigating - We’ve become aware of this issue and are investigating. (15:35 UTC — May 13) Fixed - After updating the NGINX configuration (to forward the HOST header to GoToSocial) federation appears to be flowing again. (16:03 UTC — May 13) Continued Monitoring - We will be continuing to monitor the server to ensure that federation continues working. (16:03 UTC — May 13)

We do know that it wasn't the initial move causing the problem; things were definitely working at that point…
There are a ton of "Connection reset by peer" errors in the NGINX log…
We do indeed appear to be responding 401 to everything… No idea why.
Things appear to be federating again after an NGINX configuration update… I will keep an eye on things to make sure everything begins flowing again.