Sounds like you have an access control list set up in the router that is denying your internet access. If you can login to the router you can check for any rules like this. If you can't login, try to reset the router to factory defaults and try again. Of course if you do that, you will have to reconfigure any settings you previously had.
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What model of router do you have? It could be that you have connected to a Guest wireless which requires authentication before allowing internet access.
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