Adobe Digital Editions. I'm connected to the Internet but Adobe Digital Editions can't access to the "serveur d'autorisation" (I'm french). What can I do ?

Hello

I'm in trouble with Adobe Digital Editions

I bought a ebook and i need ADE to access to it. I have downloaded ADE 4.0.3 and install it. It ask me a autorisation for the computer to admit multiple access to the ebook. I sign in but ADE told me it can't access to the "serveur d'autorisation" as if i wasn't connected to the Internet. But I'am.

what can I do ?

Thanks for helping me