IOS7 : blank browser when i try to connect to a wifi signal. Someone knows the apple-urls that are called to add to a whitelist?

I´ve a problem when i try to connect to a wifi signal, an external browser is launched and it goes blank.  Someone knows apple-urls that are called in this case?, i was thinking to add to a whitelist into my router.
Thanks.

Contact your it department.
You are blocked by a firewall.

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