If it use to work on your network and you haven't changed any router settings. You can try and "forget" your connection. Go into settings > wireless and your network should be listed. Touch and hold on your network and you should get a button "Forget Network", tap that and try to reconnect to your network.
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If it use to work on your network and you haven't changed any router settings. You can try and "forget" your connection. Go into settings > wireless and your network should be listed. Touch and hold on your network and you should get a button "Forget Network", tap that and try to reconnect to your network.