Petite nouvelle :
En fouillant sur des forums anglophones, j'ai trouvé ceci :
OK students report success with the solution (or workaround) mentioned in this thread
http://airheads.arubanetworks.com/vB...ead.php?t=4451
For anyone else having the problem, here's the way to fix it and get authorized and get on the internet again.
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Open Keychain Access. It's in Applications=>Utilities.
Then in the Keychain Access menu at the top of the screen choose "Preferences..."
Go to the pane labelled "certificates." Check the first two items there. (Online Certificate Status Protocol and Certificate Revocation List). Both should "Off." If they say "best effort" change them to "Off." Then you should be able to connect (may need to restart the computer, but maybe not).
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For those who want the somewhat geeky explanation, here's what I think is happening (I am FAR from an expert on this). Some networks (including the networks on many college campuses or dorms) use an Aruba access control system (and maybe some other brands). You're probably seen this kind of thing in other places--airports, hotels, coffee shops. This kind of system lets anyone connect to the wireless network, but then to actually do anything on that network like browse the web, get email, or whatever, you have to open a browser where you'll see a page that asks you to authenticate. Sometimes it requires a username and password, other times you just have to click the "I agree not to do anything bad" or "welcome to our Marriott" button. But in any case, unless you get through that page (the "captive portal"--isn't that a charming name?), you can't go any further.
In the latest update, Apple made a new convenience where you can connect to the network, and then instead of requiring the "captive portal" there will be a separate popup window (a webkit window) which will appear and let you login without even opening the browser. Then you're good to go. This might be familiar if you have an iPad or iPhone, because this has been the case on those devices for some time. I guess the advantage is that if you want to connect to the network and check your email, you don't have to go through the bother of first opening your browser and trying to access a page in order to get that captive portal.
But something went wrong with this in the latest update--seemingly ONLY on new MacBooks that had Lion installed from scratch. Anyone who upgraded from Snow Leopard seems not to have the problem. What I think is happening is that the browser is waiting for that webkit window to appear, and the webkit window is not appearing, because it's waiting for the browser to show the captive portal. Or something like that. Anyway, the workaround above does seem to work.
I did NOT invent this solution, and I'm not even 100% sure I understand it. Hope it works for others!
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En gros : Aller dans applications / Trousseau d'accès -> Préférences -> Certificats | à partir de là, désactiver les deux options qui sont proposées (Celle en haut)
Cela nécessite peut-être un redémarrage
J'ai fait la manip à l'instant, je commences mes cours dans 1 heure, si ça fonctionne, je vous poste un message de là bas
est-ce que quelqu'un aurait eu vent d'une solution ? Car c'est assez contraignant comme problème , merci d'avance 
