ECDSA host key for IP has changed and you have requested strict checking

[root@xx]# scp -r CentOS7.2-Mini-Newton.tar.gz newton_install-V1.0.4 / 192.168.122.100:/root/
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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 ECDSA key sent by the remote host is
SHA256:9XvufSSIeZ7MAurIZ1Qw9Z13YV1Zcim2kthmAlECgYw.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /root/.ssh/known_hosts:8
ECDSA host key for 192.168.122.100 has changed and you have requested strict checking.
Host key verification failed.
lost connection
解决方案：
文件传输不过去，只需要删除~/.ssh/known_hosts文件就能传输了

rm -rf ~/.ssh/known_hosts