Cuando nos conectamos de un sistema
linux a otro a través de SSH este guarda un registro de la conexión
y si cambiamos, por lo que sea, nuestra IP, podriamos encontrarnos
con un error algo asi
zeth@m9351:~$ ssh
192.168.0.101
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ @ 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
4a:38:09:ff:64:c2:09:2d:2c:61:dd:30:1d:46:46:3f.
Please contact your system
administrator.
Add correct host key in
/home/zeth/.ssh/known_hosts to get rid of this message.
Offending RSA key in
/home/zeth/.ssh/known_hosts:7
remove with: ssh-keygen
-f "/home/zeth/.ssh/known_hosts" -R 192.168.0.101
RSA host key for
192.168.0.101 has changed and you have requested strict checking.
Host key verification
failed.
A primera vista espanta,
luego, nos damos cuenta que no es tan complicado, sin mayor rodeo,
para solucionarlo procedemos primero a hacernos superusuarios
zeth@m9351:$ sudo su
[sudo] password for zeth:
****************
root@m9351:#
nos movemos al directorio
de SSH y listamos su contenido
root@m9351:~# cd /etc/ssh
root@m9351:/etc/ssh# ls
Dentro de este direcorio
encontraremos el fichero “ssh_host_rsa_key” el cual, y para
evitar posibles errores respaldaremos
root@m9351:/etc/ssh# cp
ssh_host_rsa_key ssh_host_rsa_key.orig
y procedemos a editar el
fichero original (yo uso el editor vim, es igual usar nano o gedit o
el que mas te guste)
root@m9351:/etc/ssh# vim
ssh_host_rsa_key
Quitamos todo lo que este
entre las cabeceras del archivo
-----BEGIN RSA PRIVATE
KEY-----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-----END RSA PRIVATE
KEY-----
Lo dejamos así y
guardamos
-----BEGIN RSA PRIVATE
KEY-----
-----END RSA PRIVATE
KEY-----
Nota: importante dejar la linea en blanco entre Begin y End
Y volvemos a Intentar
root@m9351:/etc/ssh# ssh
192.168.0.101
The authenticity of host
'192.168.0.101 (192.168.0.101)' can't be established.
RSA key fingerprint is
4a:38:09:ff:64:c2:09:2d:2c:61:dd:30:1d:46:46:3f.
Are you sure you want to
continue connecting (yes/no)? yes
Warning: Permanently added
'192.168.0.101' (RSA) to the list of known hosts.
root@192.168.0.101's
password:
Last login: Fri Feb 22
22:54:51 2013 from 192.168.0.108
[root@sisvir305 ~]#
Fin
