[K12OSN] should I be worried about this?

[Carl Keil]

I get this when I try to ssh into my k12ltsp server.
It just started happening after I rebooted last night.

[root at girlwhocouldfly root]# ssh 69.30.69.155
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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 RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
77:09:0d:18:02:84:dd:ed:53:c6:93:df:5a:c9:0c:ca.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending key in /root/.ssh/known_hosts:2
RSA host key for 69.30.69.155 has changed and you have requested strict
checking.
Host key verification failed.