今天重装fc5后，同事ssh我的电脑，得到下面的信息
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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
05:0a:08:83:48:53:0e:6c:74:43:10:26:c0:7f:61:e9.
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:9
RSA host key for 192.168.1.18 has changed and you have requested strict checking.
Host key verification failed.

编辑/root/.ssh/known_hosts这个文件
我的电脑ip是192.168.1.18，把对应的一行删除，然后重新ssh，提示yes/no，输入yes，又可以用了