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SSH Host Key Change

REMOTE HOST IDENTIFICATION HAS CHANGED Error​

I entered the scp command to send a file sudo scp ~/.ollama/models/.../library/qwen3/4b appuser@192.168.1.230:/home/.../library/qwen3/4b

It suddenly shown

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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
SHA256:8Yyfsdlptz1asdf0MGhEJfIVsSHpNTmStXVhs.
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:3
  remove with:
  ssh-keygen -f "/root/.ssh/known_hosts" -R "192.168.1.230"
ECDSA host key for 192.168.1.230 has changed and you have requested strict checking.
Host key verification failed.
lost connection

To solve this issue, the error itself has given the command to fix this.

Copy and Paste sudo ssh-keygen -f "/root/.ssh/known_hosts" -R "192.168.1.230"

Output:

# Host 192.168.1.230 found: line 3
/root/.ssh/known_hosts updated.
Original contents retained as /root/.ssh/known_hosts.old

Now try again:

Enter sudo scp ~/.ollama/models/.../library/qwen3/4b appuser@192.168.1.230:/home/.../library/qwen3/4b

The authenticity of host '192.168.1.230 (192.168.1.230)' can't be established.
ECDSA key fingerprint is SHA256:8Yshp3Cptz10MGhEspYEhlVz2ApSHpNTmQEvCStXVhs.
Are you sure you want to continue connecting (yes/no/[fingerprint])? `yes` # <--- `you need to type yes here`
Warning: Permanently added '192.168.1.230' (ECDSA) to the list of known hosts.
appuser@192.168.1.230's password:  <--- `Enter password here`
4b                                                                             100%  859     1.7MB/s   00:00