Résolu identification impossible après transfert de site

Bonjour,
je viens de migrer un site joomla de 1and1 à ovh avec akeeba backup. Tout s'est bien passé. Par contre, je n'arrive plus à m'identifier aussi bien en front qu'en back. La fenêtre de connexion se recharge mais rien ne se passe. Pas de message d'erreur...
Meme après une demande de chgt de mot de passe, le pb reste entier. Pourriez-vous m'aider svp ?

Je me réponds au cas où ça puisse aider qq d'autre, j'ai trouvé la solution.

I can't log in to my site after I restored it to a new location
This is a very common mistake with Joomla! 1.6/1.7 and later versions. What you probably not remember is that you modified the cookie setup parameters in your site's Global Configuration page. The thing is, if you modify the cookie domain name and/or path, it's very likely that you will no longer be able to log in to your site if the domain name, subdomain or directory changes - exactly what happens when you restore a site to anywhere except its original location! Luckily, the workaround is very simple. Please edit the configuration.php file in the root of your site and find the lines starting with public $cookie_domain and public $cookie_path. Modify them so that they read:

public $cookie_domain = '';
public $cookie_path = '';
Save the file, clear your browser's cookies and cache, quit and restart your browser and try logging in to your site. You should be able to login without any problem now.