Host key verification failed

[esfahankids]

با سلام
دوستان مشکلی که تازگی برای پیش اومده به یکی از سرور ها که ssh میزنم این ارور را میده نمیدونم مشکل از چیه ولی هر مشکلی هست از پی سی خودمه چون با یه پی سی دیگه که ssh میزنم مشکلی نداره
ارروری که دریافت میکنم این هست
 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 the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
(IpV6 Address)
Please contact your system administrator.
Add correct host key in /home/user/.ssh/known_hosts to get rid of this message.
Offending key in /home/user/.ssh/known_hosts:4
RSA host key for (ip addrerss) has changed and you have requested strict checking.
Host key verification failed

[esfahankids]

یادم رفت ذکر کنم که با دستور زیر ssh میزنم
ssh -l root ipaddress

[mani.zaeim]

کد: [انتخاب]

ssh <userName>@<ipAddr>
ssh root@10.0.0.1
اگر نتونستی ssh بزنی  certificate را پاک کن

[esfahankids]

بازم همین ارور
چطور certificate را پاک کنم

[mani.zaeim]

کد: [انتخاب]

cat /dev/null > ~/.ssh/known_hosts