The Sony PSP’s WPA implementation is really buggy. I could only get WPA to work on my DWL-G730AP travel router but even then it disconnects all the time. It won’t connect to my DGL-4300 at all. Speaking of the DGL-4300. Firmware 1.4 is crap! Constant router reboots which seem to mostly be related to my Vonage service so I downgraded to 1.3. Oh yea the PSP doesn’t work with the 1.3 or 1.4 firmware for the DGL-4300 if you are using WPA.