I have several WiFi networks that work perfectly. When I'm in range the n810 will automatically detect it within 5 minutes and attach. One network I have to actually manually select for no apparent reason. No matter how long I leave it in range of the AP it will not attach.

The major difference between this network and others is that this is a WPA-Enterprise network with lots of nodes. gconftool-2 does not list any keys that might shed light on the issue.