The ISATAP Router Name machine setting should be configured correctly. This policy setting allows you to specify a router name or Internet Protocol version 4 (IPv4) address for an ISATAP router. If you enable this policy setting, you can specify a router name or IPv4 address for an ISATAP router. If you enter an IPv4 address of the ISATAP router in the text box, DNS services are not required. If you disable or do not configure this policy setting, the local host setting is used. Fix: (1) GPO: Computer Configuration\Administrative Templates\Network\TCPIP Settings\IPv6 Transition Technologies\ISATAP Router Name (2) KEY: HKLM\Software\Policies\Microsoft\Windows\TCPIP\v6Transition\ISATAP_RouterName