Problems viewing internet when connected to secured connection

I am currently connected to an O2 network and it is secured but when i try to open a webpage, i get a message that reads..The webpage at ........... might be temporarily down or it may have moved permanently to a new web address.

More information on this error
Below is the original error message

Error 0 (net::OK): Unknown error.

Why is this?
i can get on the internet if i use an ethernet cable or an unsecured network!:(

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