Error Connection lost could not connect to a default or fallback server please try again latter:io.netty.channel.abstractchannel$AnnotatedConnectionExpactaion
Solution If Bungee Your bungee server may be misconfigured. Check the sub-servers IP. If that does not work. Check the bungees config and make sure that the listeners IP running on your servers IP.
If Spigot Your spigot server may not be functioning properly. Try to restart it.