Cannot Access internet on Android Browser.

Hello.
I have issue with an Sony Ericsson Xperia Active's internet. When on 3G everything seems fine.
When on Wifi:
What's not working:
1. Can't access https site from android browser. (like facebook)
Normal http webpage takes longer than usual to load.(like searches on Google)
I've tried stock browser, Dolphin Browser and next browser with the same result

What's working:
1. Android Youtube apps. Video take longer time to load.
2. Google PlayStore, no problem when downloading apps
3. Spotify -ok
4. whatsapp- ok
5. Modem router's login page (the 192.168. 1. 1)
and others


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