Wifi Setup issues

[flameboy5073]

When I try to connect using my usb dongle, one that i know works correctly on a pi for many others, i get am message after i reboot networking that says:

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No DHCPOFFERS received.
Unable to obtain lease on first try. Exiting.
Failed to bring up wlan1.
done.

Does anyone know a fix for this? This http://www.amazon.co.uk/Edimax-EW-7811U ... 003MTTJOY/ is my dongle

[flameboy5073]

These are my current settings:

/etc/wpa.config

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network={

ssid=”MY_SSID”

proto=RSN

key_mgmt=WPA-PSK

pairwise=CCMP TKIP

group=CCMP TKIP

psk=”MY-WPA-PASSWORD”

}

And in /etc/network/interfaces

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auto wlan1

iface wlan1 inet dhcp

wpa-conf /etc/wpa.config