Full airport signal, can't connect to internet

[Uduckhead]

At my local cafe my airport seems to be working great, full signal and all, and yet I get NO internet. I know it can't be the cafe's problem because their were plently of other people using the internet via wi-fi, but mine would no work at all. In network diagnostics everything was online and working except "internet" and "server" which were red. It suggested that I may have typed in "www.apple.com" incorrectly

Anyone know what the deal is? I'm on a Macbook Pro if that helps.

 

[Satcomer]

That means your local cafe is using some kind of security. Talk to them and ask, politely.