What if I can't connect to the Internet?

I am connected to wifi, but my iTunes and safari will not connect to the Internet . What can I do to fix this?

Power down your router, wait ten seconds and power it up again.
If that diesb't work, there might be a firewall in the router.  You need administrative access to the router to check that out.  If it's there, turn it off and test again.  If that solves the problem, turn it back on but make it a notch weaker.  Repeat as necessary.
By the way don't be fooled if other devices (computers) work fine through the router.  That's typical.

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