C10LE and Cisco AP 1200

I’m having an odd problem between the ThinOS C10LE and the Cisco 1200 AP. The Unit can authenticate and attach to the access point which is using 40bit open wep encryption. However, the unit is then unable to reach the dhcp server to obtain an address. If the thin client connects to a linksys AP instead (usind dd-wrt and the same security setup) it gets a dhcp address just fine. Has anyone else had any issues with this model of Cisco AP.