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cant connect my samsung galaxy phone to wifi password is fine but it keeps scanning and then says there is an authentication p

cant connect my samsung galaxy phone to wifi. The password is fine but it keeps scanning and then says there is an authentication problem
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    on some routers that are older n you may have to tweek the wifi router. i found on my router if i set it to 300n speed my devices stop working. on your router for testing turn of wep/wpa see if the phone connects. then try wep first then a wpa. also try updating the router firmware to see if it a bug.
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