Had OC Wifi connect but NO ACCESS NETWORK

I have An OMNIA I900 (with windows mobile 6.1) , he's connected on Wifi (usb Wifi key) and all work good .
Problem is that i cant share my adsl connection with Omnia cause on the Network and Sharing Center at WIFI connection there is :"NO ACCESS NETWORK" for this connection..
In the internet option on local network , Sharing is ALLOWED
but i always have this result :Access type :NO INTERNET ACCESS

Why cant i create a HAD-OC connection with network access??

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