Apsattv:
Check in Windows 7
Go in Network connections
Right click local area connection
Click status? see if if I.P V6 is connected
If not go to properties and tick Internet Protocol version 6 (TCP i.p v6) you can leave TCP V4 also ticked
If using google dns be sure to add
Replace those addresses with the IP addresses of the Google DNS servers:
For IPv4: 8.8.8.8 and/or 8.8.4.4.
For IPv6: 2001:4860:4860::8888 and/or 2001:4860:4860::8844.
Need to know how to do that in Mac OSX. The Network Prefs just say "Configure IPv6" then there is a box you can choose Manually, Automatic or Link-local Only.