The 6to4 Relay Name machine setting should be configured correctly. This policy setting allows you to specify a 6to4 relay name for a 6to4 host. A 6to4 relay is used as a default gateway for IPv6 network traffic sent by the 6to4 host. The 6to4 relay name setting has no effect if 6to4 connectivity is not available on the host. If you enable this policy setting, you can specify a relay name for a 6to4 host. If you disable or do not configure this policy setting, the local host setting is used, and you cannot specify a relay name for a 6to4 host. Fix: (1) GPO: Computer Configuration\Administrative Templates\Network\TCPIP Settings\IPv6 Transition Technologies\6to4 Relay Name (2) KEY: HKLM\Software\Policies\Microsoft\Windows\TCPIP\v6Transition\6to4_RouterName