muzing@muzing-PC:~$ ssh root@121.XX.XXX.XXX @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ 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:ez1DW+yYdDdscitJap7bQim+65hhQwDb8Nbi0Lsjjk4. Please contact your system administrator. Add correct host key in /home/muzing/.ssh/known_hosts to get rid of this message. Offending ECDSA key in /home/muzing/.ssh/known_hosts:1 remove with: ssh-keygen -f "/home/muzing/.ssh/known_hosts" -R "121.XX.XXX.XXX" ECDSA host key for 121.XX.XXX.XXX has changed and you have requested strict checking. Host key verification failed. muzing@muzing-PC:~$