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So this indicates that you are not connected to the router, or that DHCP is not working. You should try using the network-manager-gnome instructions if you are not, and if you are using the first instructions, you should try using the commands:

ifdown eth1

ifup eth1

This should re-initialize WPA and try to fetch the IP address again.

You could also try to set a static IP in order to eliminate the possibility of DHCP problems. The problem is there are many places things could go wrong; wrong passphrase, badly set up AP, many different configuration possibilities.

Try and simplify things, make sure you can get an IP normally, try temporarily using WEP or no encryption to be sure you can connect normally.