ok I manage to enter the admin panel.
I update these files:
.htaccess
.wp-config.php
.wp-blogs
.wp-site
.wp-options
with the new domain and the new path of the local site.
Then in config.php I delete the auth key and paste these lines:
define(‘ADMIN_COOKIE_PATH’, ‘/’);
define(‘COOKIE_DOMAIN’, ”);
define(‘COOKIEPATH’, ”);
define(‘SITECOOKIEPATH’, ”);
and I finally enter the admin panel.