WARNING appears in ssh connection server under linux: how to solve the problem with REMOTE HOST IDENTIFICATION HAS CHANGED

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[root@zk01 ~] # ssh localhost

@ @ @

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:r86jc/Vu8phhiKKDSntetfkmksjQ606ZlUP8XNYe44U.

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:10

Password authentication is disabled to avoid man-in-the-middle attacks.

Keyboard-interactive authentication is disabled to avoid man-in-the-middle attacks.

Permission denied (publickey,password,keyboard-interactive).

Description: Add correct host key in / root/.ssh/known_hosts to get rid of this message. The key point is this sentence.

Analysis: ssh logged on to a machine, due to changes in a machine (replacement of ip, etc.), can not log in again, report an error!

Resolution process:

[root@zk01 ~] # mv / root/.ssh/known_hosts / root/.ssh/known_hosts.bak

[root@zk01] # ssh-o StrictHostKeyChecking=no 172.16.38.130

Warning: Permanently added '172.16.38.130' (ECDSA) to the list of known hosts.

Root@172.16.38.130's password:

Last login: Sun Oct 1 12:02:21 2017 from 172.16.74.104

[root@zk01 ~] # ssh localhost # # enter the password, OK!

Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.

Root@localhost's password:

Last login: Sun Oct 1 12:04:59 2017 from zk01

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