Can't upload with flash : Erreur serveur (IO)

[Thom1]

Hi,
Here is the new gallery I just installed : http://galerie.famillesruralesvailly.org/

Uploading files using simple method (file by file) works perfectly. But uploading the same files using flashplayer doesn't work (firefox-4.0 and last flashplayer), I have a "Erreur serveur (IO)" message as you can see in the picture.
I tried to logged everything on coppermine but there is nothing about that. I use lighttpd-1.4.28 and there is nothing in lighttpd logs too.

[Thom1]

I forget to ask you nicely your help, shame on me :/

Can anyone help me please ?

[Nibbler]

Your site url is set up as https:// in the admin panel. You need to change that to http://

[Thom1]

Thanks, it works with http protocol.