wifi authentication problem

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http://forums.androidcentral.com – Help! My wifi use to connect fine for the first few months of having my phone, however now it just says "authentication problems" while trying to connect. I have for sure typed the password in correctly, i have tried forgetting the network and trying again, tried restarting my phone, tried resetting the rowder and nothing seems to be working, my other wireless devices connect fine (HowTos)