Since you need to self-host Jellyfin, then you are responsible for making the service public.

Finally found what’s causing my laptop’s DNS servers to change automatically in the background. It was the systemd-resolved FallbackDNS setting. Disabled it in a config and now I can access all my custom DNS names.

My laptop is called xontros-gatos, which in my native language means fat-cat. Similarly, my server is called server-cat, a small laptop that I have for testing stuff is called small-cat and a new laptop that I just got is called fatter-cat.

I LIKE CATS I LIKE CATS I LIKE CATS I LIKE CATS I LIKE CATS I LIKE CATS I LIKE CATS I LIKE CATS

After having upgraded my Pi-Hole to v6, for some reason yesterday it started to not recognize any of the blocklists. So, I resetted it and now it works.