So, I run my own instance (dandroid.app), and as of about 10 days ago, all outgoing federation stopped working. Incoming federation still seems to work fine. I’m not sure exactly what changed. It was around the time that I set up pihole on my network, but I have since shut down pihole and federation has not resumed. I have tried restarting all the services with docker-compose down and then up. I also tried restarting my server completely.

What debugging steps can I take to figure out where the failure is occuring?