Подключение по ssh

Пытаюсь подключится по ssh к Ubuntu-server, пишет мне следующее@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 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 is43:eb:9e:36:80:e8:c0:6b:83:4d:82:0c:c9 :8e:ca:2c.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:1RSA host key for 192.168.1.253 has changed and you have requested strict checking.Host key verification failed.Как попасть по этому протокол на сервер?