I've had a Samsung Tab 2 connected to my AT&T Wi-Fi for 6 months. Now all of a sudden it will not connect. I've removed the network and replaced it, but it just will not connect, even if I am right next to the AT&T router.
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Try restarting your modem and router. Turned them off by unplugging the power for at lease a minute, then turn on your modem/gateway first, give it a minute to boot and turn on your router.
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