I would start by doing an "netsh int ipv6 reset", this as you seem to have a lot of configuration snippets (I see amongst others a 2002:81a8:102:: address) Note also that AICCU clearly states: "[error] Tunnel Setup Failed" Did you do the 'netsh int ipv6 show route' etc commands before or after running AICCU, and did you keep AICCU running? Also, you will have to run this as a real Administrator for it to work. Next to that, it seems you have a *heartbeat* tunnel, a tun/tap device is incompatible. You need to either remove the tun/tap device (the thing you call 'stap') or more likely, as it seems you are behind a NAT: convert the tunnel to an AYIYA tunnel.