This is what worked for me: We purchased our TV one year ago, everything was great. All of suddent it wouldn't connect to wifi. Tried rebooting router, TV and everything. Tried resetting TV to factory settings, nothing. Read all the blogs to see what others did, tried entering a new DNS. Nothing. Finally resorted to calling Samsung. Told them everything I did. They had me unplug my TV from power, restart router and internet service provider box. When those were recycled and ready to go, I plugged my TV in to power and turned it on and voilla! It worked. It was slow and buffering though. So I unplugged my TV again, and turned it back on after 30 seconds. It was working fine then. Something in the TV's system must need a power recycle or something. Anyway, that's what worked for me.
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