ssh登录 The authenticity of host 192.168.0.xxx can't be established.

用ssh登录一个机器（换过ip地址）

提示错误:
The authenticity of host 139.129.x.x can’t be established.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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
5c:9b:16:56:a6:cd:11:10:3a:cd:1b:a2:91:cd:e5:1c.
Please contact your system administrator.
Add correct host key in /Users/user/.ssh/known_hosts to get rid of this message.
Offending key in /Users/user/.ssh/known_hosts:1
RSA host key for server1.example.com has changed and you have requested strict checking.
Host key verification failed.

I tried in this way but failed.
http://www.cyberciti.biz/faq/mac-os-x-remove-known-host/

And generated id_rsa.pub和id_rsa by ssh on client .

执行:
ssh -o StrictHostKeyChecking=no 192.168.0.xxx
and tried again.

提示
SSH configuration, publickeys, Permission denied (publickey,password).

ssh可同时支持publickey和password两种授权方式，publickey默认不开启，需要配置为yes。
如果客户端不存在.ssh/id_rsa，则使用password授权；存在则使用publickey授权；如果publickey授权失败，依然会继续使用password授权。

So type in “ssh servername@ip” and input password twice.

Then I can connect the remote server.

---

摘录：
某天机器又改IP了，ssh后，报：
mmt@FS01:~$ ssh -o StrictHostKeyChecking=no 192.168.0.130
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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
fe:d6:f8:59:03:a5:de:e8:29:ef:3b:26:6e:3d:1d:4b.
Please contact your system administrator.
Add correct host key in /home/mmt/.ssh/known_hosts to get rid of this message.
Offending key in /home/mmt/.ssh/known_hosts:38
Password authentication is disabled to avoid man-in-the-middle attacks.
Keyboard-interactive authentication is disabled to avoid man-in-the-middle attacks.
Permission denied (publickey,password).

注意这句
Add correct host key in /home/mmt/.ssh/known_hosts to get rid of this message.

执行：
mv /home/mmt/.ssh/known_hosts known_hosts.bak
再连：
ssh -o StrictHostKeyChecking=no 192.168.0.130

OK了!

参考：
http://blog.csdn.net/kimsoft/article/details/5865418

http://flysnowxf.iteye.com/blog/1567570