I knew free.fr is a very particular webhosting so I wrote on google session.save_path + free.fr and what I've found was that free.fr has a default hidden sessions folder that is unwritable and untouchable. BUT if you create a folder named 'sessions' in the root of the free.fr site, it becomes accessable! and everything works very well now!
Regards Robin
keywords: admin login free fre session save path