服务器重装之后连接不上及解决措施

服务器重新安装之后，从别的机器连接不上，并报以下错误

[root@zabbix ~]# ssh 10.0.0.11
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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
e1:aa:44:6a:d2:b0:9c:18:ce:1e:8a:dc:b5:b0:83:01.
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:12
RSA host key for 10.0.0.11 has changed and you have requested strict checking.
Host key verification failed.

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 IP
[root@zabbix ~]# ssh-keygen -R 10.0.0.11

/root/.ssh/known_hosts updated.
Original contents retained as /root/.ssh/known_hosts.old
把IP换成你要连的服务器就可以了。

[root@zabbix ~]# ssh 10.0.0.11
The authenticity of host '10.0.0.11 (10.0.0.11)' can't be established.
RSA key fingerprint is e1:aa:44:6a:d2:b0:9c:18:ce:1e:8a:dc:b5:b0:83:01.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.0.0.11' (RSA) to the list of known hosts.
root@10.0.0.11's password:
Permission denied, please try again.
root@10.0.0.11's password:
Last login: Sun Mar 20 03:36:01 2016 from 118.198.41.208
[root@afocus-123 ~]#