I bought WiFi dongle to my RPi and configured it. Brand is not so important, as I had access point from my Android phone and the internet worked on the RPi. However, when I try to connect to my home network, which is provided by D-Link DSL-2640B router, I cannot get internet working by any means. All I get is error "authentication request to the driver failed".
Tried all of the security options (none, WEP, WPA, WPA2), tried different settings for channels, tried different 802.11 modes... Nothing, RPi just won't connect.
Oh, and I tried of course lots of different options while manually editing the wpa_supplicant and networking/interfaces...
What's wrong with my D-Link router? I have Mac and Windows machines and Android phones connected to it with no problem at all.