Hello, I've been having trouble connecting my Macbook Air to public wifi in several airports (Denver, San Diego most recently). I select the SSID and get the signal just fine. When I launch Safari or Firefox, I see a redirect to an authentication page - but it never comes up - it just hangs. Using my iPhone and Safari, I can connect just fine. When the iPhone browser gets to the redirect screen, it comes up with a dialog box asking to accept a security certificate. On the Macbook, I never get asked about a certificate. I can't find any settings that change this behavior. I am not blocking pop up windows blocked and I am accepting cookies. Any ideas on how to resolve this? I see lot's of other Macbooks in the airport browsing away so I know I must be doing something wrong. Thanks in advance for any suggestions.