linux ssh 连接错误 WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

素颜马尾好姑娘i 2021-07-29 02:14 299阅读 0赞

一、今天在使用SSH，连接远程服务器的时候，刚开始是没问题的。  
后来阿里云主机重装了一下系统后，再也连不上了。一直报一个错。

$ ssh root@47.98.233.15
    @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
    @    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、解决方法，看错误日志中有一句

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

注意这个文件因环境不同而不一样，使用root用户则是：/root/.ssh/known\_hosts

三、以编辑器的方式进入这个文件

vi /Users/wangdong/.ssh/known_hosts

四、将红线框部分删除掉  可理解为：删除远程ip对应的信息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3doYXRkYXk_size_16_color_FFFFFF_t_70][]

五、再次进行远程连接

$ ssh root@47.98.233.15              
    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.
    root@47.98.233.15'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:~#

问题就解决了，原因是进行远程连接上，输入yes后，本机会将远程机器的信息，写到/Users/wangdong/.ssh/known\_hosts文件中，如果远程重装系统了，本机一定要先清理掉远程机器的信息，才能再次连接成功。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3doYXRkYXk_size_16_color_FFFFFF_t_70]: /images/20210728/9865c88ca905428e94f4411180acdb3e.png