WP8.1 always connection failure...

Ok yesterday but start to suffer from connection failure from today on Windows Phone 8.1 (Lumia 920, wp8.1 update develop preview). Here is the alert information each time I try signing in: We're having trouble connecting to duolingo right now. check your connection or try again in a bit.

November 23, 2014

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每天 5 分钟就能学一种语言了!且完全免费!