http://www.tonymacx86.com/mountain-lion-desktop-support/64547-icloud-app-store-facetime-messages-unable-authenticate.html
I see you resolved the issue but here's another way I've been guided
navigate to Library/Preferences/SystemConfiguration and then delete NetworkInterfaces.plist
app store unknow error solved
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转载自macleo.iteye.com/blog/1738623
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