@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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
ff:c7:68:bd:a7:5e:59:34:c8:62:ff:7e:0b:e8:18:f0.
Please contact your system administrator.
Add correct host key in /home/riccardo/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /home/riccardo/.ssh/known_hosts:20
ECDSA host key for 88.149.234.157 has changed and you have requested strict checking.
Host key verification failed.