My MacBook Air connects to my company network, but will not connect to the internet through the network. It shows this message: 

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> Wi-fi has the self-assigned IP address 169.254.20.235 and will not be able to cnnnect to the Internet.
> 
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In *Advanced Settings*, I've tried to renew the DHPC lease to no avail. I am not in position to shut down the company router, so I've got to work through the Mac. It works fine at my home network.