我重新安装了我的服务器，我收到这些消息:
[user@hostname ~]$ ssh root@pong
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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 RSA key sent by the remote host is
6e:45:f9:a8:af:38:3d:a1:a5:c7:76:1d:02:f8:77:00.
Please contact your system administrator.
Add correct host key in /home/hostname /.ssh/known_hosts to get rid of this message.
Offending RSA key in /var/lib/sss/pubconf/known_hosts:4
RSA host key for pong has changed and you have requested strict checking.
Host key verification failed.
我尝试了在网上找到的各种解决方案。我的known_hosts文件(通常在~/.ssh/known_hosts中)在/var/lib/ss /pubconf/known_hosts中。我试图编辑它，但它仍然是一个状态。我已经安装了ipa-client和Fedora 19。如何解决此警告?
到目前为止回答的所有答案都只适用于没有安装Freeipa的情况。
下面adrin的评论中关于freeipa的正确答案在这里。
The problem is that you've previously accepted an SSH connection to a remote computer and that remote computer's digital fingerprint or SHA256 hash key has changed since you last connected. Thus when you try to SSH again or use github to pull code, which also uses SSH, you get an error. Why? Because you're using the same remote computer address as before but the remote computer is responding with a different fingerprint. Therefore, it's possible that someone is spoofing the computer you previously connected to. This is a security issue.
如果你100%确定远程计算机没有被入侵、被黑客攻击、被欺骗等，那么你所需要做的就是删除远程计算机的known_hosts文件中的条目。这将解决问题，因为连接时将不再与SHA256指纹id不匹配。
在Mac上，我是这么做的:
1)找到输出行为servername读取RSA主机密钥:端口已更改，您已要求严格检查。您需要日志输出中的服务器名和端口。
2)备份SSH已知主机文件“cp /Users/yourmacusername/”。ssh / / yourmacusername / . ssh / known_hosts /用户known_hosts.bak
3)找到存储计算机旧指纹的行，并删除它。您可以使用步骤1中的服务器名和端口搜索特定的违规远程计算机指纹。纳米/用户/ yourmacusername / . ssh / known_hosts
4)按CTRL-X退出，选择Y保存修改
现在输入ssh -p port servername，您将收到您第一次尝试ssh到该计算机时所做的原始提示。然后，您可以选择将远程计算机更新的SHA256指纹保存到known_hosts文件中。如果您正在使用端口22上的SSH，那么-p参数是不必要的。
cp /Users/yourmacusername/.ssh/known_hosts.bak /Users/yourmacusername/.ssh/known_hosts.bak /Users/yourmacusername/.ssh/known_hosts.bak
