Windows 7 tunnel offline

Hi everyone, i successfully set-up a tunnel and have been using it without any problems until this happened:

_i'm connected and i can ping any ipv6
_the dsl carrier goes down and comes back up (i have a static ip)
_i'm not able to ping any ipv6 or connect to ipv6 servers/websites

I tried to use ipconfig /renew6 and got a few errors:

D:\>ipconfig /renew6

Configurazione IP di Windows

Error during renewal of interface Local Area Connection: timeout.

Error during renewal of interface Loopback Pseudo-Interface 1: Impossibile to find specified file.

Error during renewal of interface IP6Tunnel: Impossibile to find specified file.

(i have translated the error messages from italian to english just to make them more widely understandable)

Any ideas?