Wifi-Shield problems with Arduino Due.

hi all,
i tried wifi-shield on arduino due board.

the shield correctly works on arduino uno (connecting lan, receiving , sending on internet etc.)
but not property works on arduino due.

i tried examples tutorials understad:
1) when try scannetworks correcttly find lan.
2) when try wifiwebclient not works:
on first monitor answer "no wifi shield" , give me same answer resetting board.
after resets try connect, without goal.
only 1 time connected lan, , server (www.google.com), not gave http request answer.

i use:
- arduino due programming port (it correctly works many scratches)
- wifi shield r3 firmware v.1.1.0
- external power suply of 12v 4a (center positive)
- opertaing system ubuntu 14.04
- ide 1.6.3

i don't know why shield doesn't works...
tank suggestion.

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