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mount.cifs not working anymore

I am not sure I tested it since I upgraded from Jessie to stretch :

I have the following entry in my fstab

//mafreebox.freebox.fr/Disque\040Dur /mnt/Fbx cifs 
0               0

It used to work, now it says :

@bibi:~ % mount /mnt/Fbx
mount error(112): Host is down
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

Using smb:// in dolphin works, so the smb server is still working. What
can be the reason ?