SSH

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https://help.ubuntu.com/community/SSH
https://help.ubuntu.com/community/SSH/OpenSSH/Keys
https://help.ubuntu.com/community/SSH/OpenSSH/Configuring

$ ssh root@123.123.123.123
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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
SHA256:*******************************************.
Please contact your system administrator.
Add correct host key in ~/.ssh/known_hosts to get rid of this message.
Offending RSA key in ~/.ssh/known_hosts:21
RSA host key for 123.123.123.123 has changed and you have requested strict checking.
Host key verification failed.

Solution: add the output of the following command to ~/.ssh/known_hosts:

$  ssh-keyscan -t rsa 123.123.123.123

or:
$ ssh-keygen -R 123.123.123.123

Issues related to this page:

ProjectSummaryStatusPriorityCategoryLast updatedAssigned to
Linux softwareSSH server and securityactivecriticalsupport request7 years 28 weeks
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