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
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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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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:
Project | Summary | Status | Priority | Category | Last updated | Assigned to |
---|---|---|---|---|---|---|
Linux software | SSH server and security | active | critical | support request | 14 years 23 weeks | |
Linux software | KDE: What are gpg-agent and ssh-agent? | active | normal | feature request | 8 years 26 weeks | |
Linux server | How to upload ssh keys to server so that I don'… | active | normal | support request | 8 years 26 weeks |