"Launching game host failed [121758208]"

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Hi,

I'm trying to play 2 player coop on some story levels. My brother and I are using the same internet in the same house and although we could connect in the beta, we have been unable to connect in this product. We are the same race.

I get this error every time after waiting for 30 seconds:

"Launching game host failed [121758208]"

Any help getting this brand new product to work would be nice (sorry for the pure evil comment and expecting coop to work properly).

Thanks

PS: Support forum yielded no responses.

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i cant believe it.. played coop last weeks.. i have changed nothing, upnp active, nat open... an still this error, tried several different quests...

any solution?