在linux系统下，我们经常需要远程连接到某个服务器，以进行大量的运算，但是在连接的过程中，也会出现一些错误，如下：

tao@Tao-PC:~$ ssh yangtz@119.78.162.44
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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 a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
ac:fb:49:a7:14:33:af:38:01:78:be:c2:2e:70:67:13.
Please contact your system administrator.
Add correct host key in /home/tao/.ssh/known_hosts to get rid of this message.
Offending RSA key in /home/tao/.ssh/known_hosts:1
 remove with: ssh-keygen -f "/home/tao/.ssh/known_hosts" -R 119.78.162.44
RSA host key for 119.78.162.44 has changed and you have requested strict checking.
Host key verification failed.

此时按照里面的提示，在终端输入如下命令：

ssh-keygen -f "/home/tao/.ssh/known_hosts" -R 119.78.162.44

即可解决问题，重新登陆就可以啦。