Lumia 925 can't connect to facebook account over wi-fi

[simi_id]

Hello,

I have a Lumia 925 and I can't connect to facebook account over Wi-Fi (Belkin N+ router).
If I use only 3G I can connect without any problem, but if I enable wi-fi, I can't connect anymore.
This issue is only for facebook since I can connect to microsoft account, linkedin account and so on.
What might be a solution ?

Thanks