Recently while working with a customer to configure Windows Server 2012 R2 DirectAccess I encountered an issue with Teredo failing after enabling multisite. The remote access management console reported the following error:
Teredo: Not working properly Error: Forwarding is disabled on the Teredo server.
The resolution is simple enough. Enable forwarding on the Teredo interface! To do this we’ll need to identity the interface index of the Teredo Tunneling Pseudo-Interface and then enable forwarding using netsh.exe. Open an elevated command prompt and issue the following command:
netsh interface ipv6 show interface
Make a note of the Teredo tunneling interface index and then enable forwarding on this interface by issuing the following command:
netsh interface ipv6 set interface forwarding=enabled