Whoops, the IP address of the server changed, and I recently took down the old server (which was forwarding the traffic to the new IP address).
I just changed the settings, it should work fine in 30 minutes again.
Masterserver should function properly-ish. I used to host it myself, but in 2019 I let it forward it's traffic to 333networks, but unfortunately their server is regularly offline as well
but I don't have the time (nor want to spend the funds) to power my own masterserver.