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Trouble Obtaining IP Address

I'm using an MC3090 and trying to connect to a router via WEP 40-bit encryption. Once I connect to the network and try to request an internet page I receive an error in my browser: "The page cannot be displayed . . . Cannot find server or DNS error." The barcode scanner seems to be connected to the LAN and is displaying an excellent signal strength. When I go to *wireless status* -> *IPv4 Status* I notice that my IP Address and Subnet are empty for about 20 to 40 seconds, then they flash values on the screen for 2 or 3 seconds, then the lease expires and the values go empty again. The cycle is continuing on indefinitely, 1) lease an IP, 2) IP expires, 3) renew and repeat. The router and wireless connection both work just fine on my MacBook Pro.

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