I HAD the same problem, until I enabled BOTH TKIP and AES on the router. I had set the router to AES for an 802.11n issue for my laptop. I had to download and install beta firmware for the WRT-350N. Then I could select BOTH TKIP and AES on the router. It seems that TKIP is needed for WPA-PSK on the XV-6700 running the 12/17/2007 Helmi.
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