Blizzard's login server (the server that keeps the database of all their login names and passwords) has been very touchy basically since WoW started. Sometimes it is working and sometimes it is not. When it gets stuck on "Authenticating," it means the login server is down. You just have to wait a while for it to get fixed and then it'll work. It's not anything you're doing, but one of those glitches that Blizzard needs to get worked out.
And yes, Hal, this game will do just that.
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