我遇到了这个错误：
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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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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
21:0e:54:f2:0c:d8:bc:a1:1c:72:e0:3b:e9:ae:f9:82.
Please contact your system administrator.
Add correct host key in /nfs/home/kkochetov/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /nfs/home/kkochetov/.ssh/known_hosts:1
remove with: ssh-keygen -f "/nfs/home/kkochetov/.ssh/known_hosts" -R 192.168.1.71
RSA host key for 192.168.1.71 has changed and you have requested strict checking.
Host key verification failed.
之后ssh-keygen -R 192.168.1.71，问题得到了解决，但仅在大约 10 分钟后解决。然后服务器丢弃了我，在下一次连接尝试后我再次收到相同的错误。然后我ssh-keygen -R 192.168.1.71再次输入，但在这一刻之后我的密码不再适合。有什么问题？如果我尝试在另一台机器上做同样的管道，它会是一样的。（第一次尝试没问题，但10分钟后第二次尝试同样的问题）
有谁能够帮我？