scp不可用：WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED

WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

After doing ssh are you seeing this error.No problem it can be solved.

root@tuxworld:/tmp# ssh 10.10.0.16
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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 RSA key sent by the remote host is
:f2:a2::ff::e5:::b4::::c2:fb:.
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:
  remove with: ssh-keygen -f "/root/.ssh/known_hosts" -R 10.10.0.16
RSA host key for 10.10.0.16 has changed and you have requested strict checking.
Host key verification failed.
root@tuxworld:/tmp#

Why it happens ?
Answer : Because it is mismatch of fingerprint
information which is saved in .known_hosts file in your system with
fingerprint value available in Server.

How to solve the issue

You have to delete the particular line from ~/.ssh/known_hosts file.
see the line no. 12 in above message “Offending ECDSA key in /root/.ssh/known_hosts:11“.
In line you are getting number 11 . Hence this is the line no. in known_hosts which you have to delete.

Here we will use vi editor to directly jump into that line number

vi + ~/.ssh/known_hosts

Cursor will automatically move to line number you only have to type dd in vi editor to delete the line and then type :wq for save and exit

dd
:wq

当然，这里可以把指定ip的message删除掉。再次执行scp，系统会生成最新可用的message。

具体相关信息，可参看：http://sharadchhetri.com/2013/06/03/warning-remote-host-identification-has-changed/