Mac和Linux遠端連接配接伺服器異常修複（WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!）

一、今天在使用SSH，連接配接遠端伺服器的時候，剛開始是沒問題的。

後來阿裡雲主機重裝了一下系統後，再也連不上了。一直報一個錯。

~ ⌚ 22:49:52
$ ssh [email protected]
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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 ECDSA key sent by the remote host is
SHA256:8hgJ8jpcBr1tm6HS72FpXwMrjba8MQqlqYJQLPB/Qf4.
Please contact your system administrator.
Add correct host key in /Users/wangdong/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/wangdong/.ssh/known_hosts:26
ECDSA host key for 47.98.233.15 has changed and you have requested strict checking.
Host key verification failed.           

二、解決方法，看錯誤日志中有一句

Add correct host key in /Users/wangdong/.ssh/known_hosts to get rid of this message.           

三、以編輯器的方式進入這個檔案

vi /Users/wangdong/.ssh/known_hosts           

四、将紅線框部分删除掉

五、再次進行遠端連接配接

~ ⌚ 22:52:18
$ ssh [email protected]              
The authenticity of host '47.98.233.15 (47.98.233.15)' can't be established.
ECDSA key fingerprint is SHA256:8hgJ8jpcBr1tm6HS72FpXwMrjba8MQqlqYJQLPB/Qf4.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '47.98.233.15' (ECDSA) to the list of known hosts.
[email protected]'s password: 
Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.4.0-105-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

Welcome to Alibaba Cloud Elastic Compute Service !

root@iZbp17cj14ulhfrlj02rkaZ:~#            

問題就解決了，原因是因為才重裝系統後，再次進行遠端連接配接上，在輸入yes後，本機會将遠端機器的資訊，寫到/Users/wangdong/.ssh/known_hosts檔案中，是以如果遠端重裝系統了，本機一定要先清理掉。