I know a lot of you guys, android users faced this problem, I've red a lot of threads about it. Some of user say that you have to buy new router. But that is not truth. Easiest way to solve this problem is to go to:
Control Panel/Network/Network Infrastructure and press the second mouse button on your routers icon/Then press View device webpage/When you are in the webpage you'll need login and password which is usually admin, admin. Press ok and continue/Go to Network Connections/LAN Wireless 802.11g Access Point (it's called that in my computer)/Wireless/Then search for name "security" after that you just choose security type near that name and just select "None"/Confirm your change in the bottom of the page and you should probably have no authentication problems from now on. (Marking security as "None" makes your connection password disappear. But I believe if you put your security back on you'll have the same error back again.
Even if you won't have the security, you will still save up some money instead of buying new router.
Also I didn't checked all of the security possibilities. Some of them might also work.
Control Panel/Network/Network Infrastructure and press the second mouse button on your routers icon/Then press View device webpage/When you are in the webpage you'll need login and password which is usually admin, admin. Press ok and continue/Go to Network Connections/LAN Wireless 802.11g Access Point (it's called that in my computer)/Wireless/Then search for name "security" after that you just choose security type near that name and just select "None"/Confirm your change in the bottom of the page and you should probably have no authentication problems from now on. (Marking security as "None" makes your connection password disappear. But I believe if you put your security back on you'll have the same error back again.
Even if you won't have the security, you will still save up some money instead of buying new router.
Also I didn't checked all of the security possibilities. Some of them might also work.
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