Wednesday, May 21, 2014

Host Key Verification Failed

Most of the time we may encounter following error. Such a error may occur if remote host may change or regenerated the RSA key. So how to solved the issue.
jpudasaini@Gnome:~/Downloads$ ssh root@10.0.2.37
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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
f3:30:b1:66:ea:0d:e4:06:2e:10:8b:ca:df:33:fa:34.
Please contact your system administrator.
Add correct host key in /home/jpudasaini/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /home/jpudasaini/.ssh/known_hosts:17
  remove with: ssh-keygen -f "/home/jpudasaini/.ssh/known_hosts" -R 10.0.2.37
ECDSA host key for 10.0.2.37 has changed and you have requested strict checking.
Host key verification failed.
This error will happen due to the remote host change the host key.
ssh-keygen -R 10.0.2.37
jpudasaini@Gnome:~$ cd /home/jpudasaini/.ssh/
jpudasaini@Gnome:~/.ssh$ ls
known_hosts  known_hosts.old
jpudasaini@Gnome:~/.ssh$ sudo vi known_hosts
[sudo] password for jpudasaini:  (type your password)

Delete line 17 form opened file or

jpudasaini@Gnome:~$sed -i 17d ~/ssh/known_hosts

This will delete line 17 in the /ssh/known_hosts file

Now you retry to login to the remote host. Accept new key and ready to go.

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