https://imgur.com/a/4V0Zv
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I am unable to connect too (wotlk)
I have the same problem today.
It says to me: "Connecting" than I am waiting a lot, and after this it says "Unable to connect. Please try again later. If the problem persists, please contact technical support at: ...some blizzard link..."
I logged in with my account name as I allways do this every day without a problem for at least a year, but today it just doesn't want to let me in...