Dear, Every Time if I try to connect to the server (.org/ .net), I got the message like on the picture. I don't know what to do. I'm just running the vanilla 1.11.2 client. Please help Thanks
You're being constantly banned by console because it thinks you are fly hacking when you're probably falling. You could arrange to try logging in when a moderator is in-game here, or try logging in a few times at different hours of the day so that a moderator who sees console banning you over and over can tp you away from the issue.
You could also try logging in with minechat, because on minechat you can turn a feature on where it makes you do /spawn the instant you join the server.
With minechat, you just login with your minecraft account information then there is a button where you can add a server. Just put in skyblock.net, and turn the option to /spawn as soon as you connect on, and everything should work.
Some new players are experiencing this as they're falling through spawn when they log in and then get "banned" for flying. I've been able to fix it for a few other players by logging into their account while logged into my own and then quickly forcing teleport to my island to stop their falling, then making a new island for them, or solidifying the blocks at their island, which usually fixes the problem permanently. If you have a tendency to get banned for flying with your internet connection, then you may still get banned occasionally while falling but it should not occur on login. Send me a PM if you want me to try logging in and fixing it for you. Make sure to change your password before and after I use it!
The anti-cheat was removed, you should not get kicked for flying anymore. If you are still getting kicked, PM an online mod to TP you to spawn.