[Owncloud] Pb to connect via linux Nautilus

[BILLARD]

Yestarday i installed owncloud 1.2 on my PC under Linux debian, an all 
was ok, connecting with browser and nautilus (webdav). I think it's a 
very good project.

Today i try it whith my webhoster, i can install owncloud an connect via 
the browser iceweasel.
But when i try connect with nautilus (webdav) it's impossible. Nautilus 
always ask my password ?

owncloud is a this adresse

http://stockage.billard-francois-marie.eu/

and in nautilus config is :

dav://XXXX@stockage.billard-francois-marie.eu/webdav/owncloud.php

thank's

François Billard