En fait je viens de me rendre compte que j'avais oublié cette ligne de commande :
Méthode sous Linux :
ssh root@ip_du_serveur -L 8888:localhost:32400
Quand je rentre cette commande dans putty j'obtiens ça :
root@ns331674:/home/youri# ssh root@37.xxx.xxx.124 -L 8888:localhost:32400
The authenticity of host '37.xxx.xxx.124 (37.xxx.xxx.124)' can't be established.
ECDSA key fingerprint is 01:c9:b4:8e:75:e8:ed:8d:a1:a9:95:18:57:f4:1b:70.
Are you sure you want to continue connecting (yes/no)? y
Please type 'yes' or 'no': yes
Warning: Permanently added '37.xxx.xxx.124' (ECDSA) to the list of known hosts.
Debian GNU/Linux 8
root@37.xxx.xxx.124's password:
Permission denied, please try again.
root@37.xxx.xxx.124's password:
Permission denied, please try again.
root@37.xxx.xxx.124's password:
Permission denied (publickey,password).