With redhead's help I was able to get my Ubuntu server up and running on my WPA encrypted network some time ago.

Since then, I have shut down my server to clean up my office and now after restarting it and running wpa_supplicant and then stopping and restarting the network I still cannot get an IP address.

It appears to be authenticating to the router as it picks up the router SSID, MAC address, etc., but whenever I ping the router I get:

connect: Network is unreachable
I know this should be an easy fix. Promise to write it down this time.