I can not join multyplayer minecraft servers if i want to.

So i can not join some minecraft multiplayer servers as: mc.Cytooxien.de

What should have happened is, i wanted to join and nothing big happens just me joining a server.

But what happened was i clicked on the server mc.Cytooxien.de to play tryjump, but when it spawns me in the world it kicks me straight back to the MC launcher.

Steps to Reproduce:
1. open up the launcher and put in the version 1.11
2. add the server mc.Cytooxien.de
3. and then launch the server
thats how it happened to me at least...