Multiplayer doesn't work

Guys, help me. Just a couple of days ago, I started playing online with a friend. Everything was working fine. We were playing on the "Asia" server. Also, in multiplayer, other players' regions were visible, and everything was fine. But then, yesterday, everything suddenly stopped working. Other people's servers aren't showing up, and I can't create a world in multiplayer; it just kicks me back to the menu with an error. I've tried everything, what should I do?