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Hi,I'm sorry about the issue. Do you mean when you connect the kindle to your Wi-Fi / wireless network name, it says Authentication problem?
Does your kindle have touchscreen?What is the make/ model of your Internet modem/router device?Do you have a laptop / wireless computer that is currently connected via wireless? If so, does it have Windows xp, vista, or 7, 8, 10, or Mac? Please type at the box below, then click on the Send button below to communicate with me, so I can help. Thank you,