Ok so sometimes this IPv4 to IPv6 shim can become a problem and in some cases it does not appear in the list of adapters where you can quickly disable it. Fortunately there is a way to quickly disable the Teredo Tunneling interface using the command line. Open an elevated command window and type the following command:

netsh interface teredo set state disabled

image

You can read more about 6to4 adapter commands here http://technet.microsoft.com/en-us/library/cc730854(WS.10).aspx