Q: I can't login via ssh to my install client.

> ssh -l root bigfoot
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the host key has just been changed.
Please contact your system administrator.
Add correct host key in /home/lange/.ssh/known_hosts to get rid of this message.
Password authentication is disabled to avoid trojan horses.
Permission denied.

A: After you have reinstalled FAI on your server a new ssh host key is
   generated. Remove ~/.ssh.known_hosts and try again.
