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Top Forums UNIX for Beginners Questions & Answers Host key verification failed error Post 302992335 by Aia on Thursday 23rd of February 2017 09:03:03 PM
Old 02-23-2017
Quote:
Originally Posted by scriptor
HI

i am getting host key verification failed error.

Code:
[root@pe1zz1 scripts]# cat id_rsa.pub | ssh root@10.110.51.245 'cat >> .ssh/authorized_keys;exit;'
cat: id_rsa.pub: No such file or directory
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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 the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
e3:7c:d9:f2:3e:f1:9a:58:17:48:89:f8:62:ae:31:fc.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending key in /root/.ssh/known_hosts:1
RSA host key for 10.110.51.245 has changed and you have requested strict checking.
Host key verification failed.

i have googled and found the way out to fix the problem which mentioned below

Code:
sed -i '1d' ~/.ssh/known_hosts

but i am not sure the after affect of this. as i have to work live servers.

is this the safe way ?
please let me know the after affect of this ?

Regards,
scriptor
On default mode, the first time ssh tries to connect to a node it records a fingerprint signature of the node in the file known_hosts and it associates that signature with the fqdn or ip it was used. In subsequent connections it will consult with that record to verify it is the same. If another node is used with the same fqdn or ip address it will complain, since it could be that another box is pretending to be the node you want to login to.
It is even safe to delete the whole known_hosts, as it will not affect any remote live servers. However, you'll loose those saved recorded first identifications.
 

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SSH2_AUTH_PUBKEY_FILE(3)						 1						  SSH2_AUTH_PUBKEY_FILE(3)

ssh2_auth_pubkey_file - Authenticate using a public key

SYNOPSIS
bool ssh2_auth_pubkey_file (resource $session, string $username, string $pubkeyfile, string $privkeyfile, [string $passphrase]) DESCRIPTION
Authenticate using a public key read from a file. PARAMETERS
o $session - An SSH connection link identifier, obtained from a call to ssh2_connect(3). o $username - o $pubkeyfile - The public key file needs to be in OpenSSH's format. It should look something like: ssh-rsa AAAAB3NzaC1yc2EAAA....NX6sqSnHA8= rsa-key-20121110 o $privkeyfile - o $passphrase - If $privkeyfile is encrypted (which it should be), the $passphrase must be provided. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Authentication using a public key <?php $connection = ssh2_connect('shell.example.com', 22, array('hostkey'=>'ssh-rsa')); if (ssh2_auth_pubkey_file($connection, 'username', '/home/username/.ssh/id_rsa.pub', '/home/username/.ssh/id_rsa', 'secret')) { echo "Public Key Authentication Successful "; } else { die('Public Key Authentication Failed'); } ?> NOTES
Note The underlying libssh library doesn't support partial auths very cleanly That is, if you need to supply both a public key and a password it will appear as if this function has failed. In this particular case a failure from this call may just mean that auth hasn't been completed yet. You would need to ignore this failure and continue on and call ssh2_auth_password(3) in order to complete authentication. PHP Documentation Group SSH2_AUTH_PUBKEY_FILE(3)
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