I had similar issue. Please check your wi-fi router's MTU setting. Router Admin page > Network > WAN > Advanced > MTU Size (in bytes). This could be different for your router
Internet access was working great in
1. One of my laptops with Windows 8.1 OS
2. My Android mobile (Redmi 1S)
But I was facing the peculiar issue of only Google, YouTube (IPv6) sites opening while all other sites (IPv4) not opening in
1. one Windows 7 laptop
2. Nokia Lumia 520
After trying every solution suggested in the web, I finally hit one site, that suggested changing the MTU in router. My router's default MTU setting was 1480, which I changed to 1430. Voila! the issue is resolved.
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