Is it possible to do some coop in LAN ?

Hi,

I've invited a friend to play @home. We can connect to the server and do some quests, but when we tried to begin a coop quest or a pvp match, we have an error (translated from french:

"[Friend Group] [BlueGeckoO] : Connection to Xbox Live failed: BlueGeckoO wasn't able to connect to Maoboy8"

(In french in case I mistranslated something... :

"[Groupe d'amis] [BlueGeckoO]: Echec de la connexion à Xbox LIVE : BlueGeckoO n'a pas pu se connecter à Maoboy8"

I also check port forwarding on my router and it seems correct .. (done by upnp, I did not to anything)

Need some help here ;)

Thanks !

|||Check both NATs in GFWL to see whos is not open.|||I checked windows firewall :p The game was set tu "public" and not "private" for an mysterious reason, it works fine now !
|||No