mail.yahoo.com
www.rt.com
Chrome doesn't allow disabling ipv6 (though I guess I can disable it in network adapter)...
a lot of IPv6 adresses do work, and the two sites above it attempts a connection and sends a few packets back and forth, (I do receive also) but it does not complete the connection.
in the case of RT.com I tried accessing through a proxy site and it was able to load; but I am unable to connect from my network...
The problem with Yahoo is Yahoo's fault. The only "correction" that works with regard to Yahoo is the ipv4 only entry in the "hosts" file. They should not have a working IPv6 DNS entry if their web server won't accept the connection, yet they do.
I don't use the rt.com site, so I can't offer any suggestions regarding it.