ssh connect problem as a record

(new3)mlzboy@mlzboy-laptop:~/bijia/sblity/src/new3$ ssh mlzboy@10.3.11.240
ssh: connect to host 10.3.11.240 port 22: No route to host
(new3)mlzboy@mlzboy-laptop:~/bijia/sblity/src/new3$ ssh mlzboy@10.3.11.248
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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
c0:f6:45:c4:20:0e:61:78:b4:84:74:93:ca:38:0f:4e.
Please contact your system administrator.
Add correct host key in /home/mlzboy/.ssh/known_hosts to get rid of this message.
Offending key in /home/mlzboy/.ssh/known_hosts:10
RSA host key for 10.3.11.248 has changed and you have requested strict checking.
Host key verification failed.
reference:
http://wxmfly.javaeye.com/blog/413905


这是Linux重装或则openssh-server重装引起的，执行以下命令即可
ssh-keygen -R myShareBook.cn
把myShareBook.cn换成你要连的服务器就可以了。