Ran into an interesting issue today. Friend from Japan messaged me that they were having issues connecting to Google and YouTube. I remoted into their computer and found something interesting. Google and YouTube were resolving to IPv6 addresses.
I'm thinking Japan's ISP's are upgrading their networks to IPv6. Still, I found it strange that even though Google and YouTube were resolving properly, the pages wouldn't render. Only those people connected directly to their modem would likely see this issue, if you are behind a router, then this issue would likely not manifest.
Anyway, to resolve this issue just requires that IPv6 be unbound from the Network Adapter setting in Windows. Below a sample screenshot from my Windows 7 VM.