Connection was interrupted?

My buddy can't play Minecraft because it shows the following:

Can someone tell me how it goes away?

Maybe banned
or Cracked Minecraft version

Is this the case with every server that he enters? If not, it is up to the server that he wants to access.

For me this helps: go back to the server selection, press update and try again.

If that doesn't help, send support to Mojang.

It is the same with every server, he said

Ok let's see. I tell him.

Is his account originally purchased? Otherwise just reinstall the game.