This I hope is the post that fixes your connectivity problems between Kindles and D-Link N routers. We have an 868L but there seems to be a load of extra posts around the internet about this problem but the solutions seemed to be conflicted.
I recently replaced my old router and copied all the settings across and all devices connected except our Kindles – we have Kindle 3’s (the ones with the keyboards) and Paperwhites.
I got these to connect by not using WPA2 as a wireless security protocol. So WPA Mode should be set to WPA and the Cipher Type should be set to TKIP. At this point all of the Kindles connected.
I post this because the other options that I have seen out there (change the SSID to uppercase, disable n mode – use a/g only) did not work for me and there seems to be a lot of frustrated people out there.
Hope this helps. To Amazon and D-Link, can you figure out which of you needs to patch their firmware and fix this. BTW my 868L is on firmware version 1.07 and the hardware version is A1 and the Kindles have the latest firmware too.
Justin's Ramblings 