I tried to update to the new web interface and destroyed something. I could not fix it an simply installed the new Image of Turnkey.
But now the server is not listing on IPv6 anymore. this is a huge problem since I only have IPv6. I was running Bukkit 1.7.9 befor. Now it is 1.8.3 Craftbukkit from getspygot.org
I solved it already.
What was the solution?
One has to set ip in server.properties to ::