io.netty.channel.abstractchannel$annotatedconnectexception: Connection refused: no further information popped up and now I cannot log in to my friend's java realm.

io.netty.channel.abstractchannel$annotatedconnectexception: Connection refused: no further information has popped up and I cannot join one realm but can still join other realms. My friend's account is not lost and my firewall isn't blocking anything. Plus the server is still up.