wpa_supplicant on Debian doesn't connect to network

Question

I'm currently trying to connect to my home WiFi network (WPA2 security), but when I run sudo wpa_supplicant -B -D wext -i wlan0 -c /etc/wpa_supplicant.conf, running /sbin/iw wlan0 link immediately after always returns Not Connected. sudo dhclient -v wlan0 returns No DHCPOFFERS Received.

Running sudo iwconfig wlan0 scan shows that the network I'm trying to access is indeed in range and accessible, so the problem must be local.

I've checked wpa_supplicant.conf and the psk and ssid are definitely correct. The full contents are:

ap_scan=1
ctrl_interface=/var/run/wpa_supplicant
network={
    ssid="<SSID>"
    scan_ssid=0
    proto=WPA
    key_mgmt=WPA-PSK
    #psk="<pw>"
    psk=<converted psk from wpa_passphrase>
    pairwise=TKIP
    group=TKIP
}

The contents of my /etc/network/interfaces file are:

auto wlan0
iface wlan0 inet dhcp

wpa-ssid <SSID>
wpa_psk <PW>

wpa-ap-scan 1
pre-up sudo /sbin/wpa_supplicant -i wlan0 -Dwext -c /etc/wpa_supplicant.conf
pre-up sleep 5
post-down sudo killall -q wpa_supplicant

EDIT:

I changed the contents of /etc/wpa_supplicant.conf to hold

pairwise=AES
pairwise=AES

but that got me an invalid cipher error, so I set both to AES-CCMP, which got me...the same error. I ended up just commenting those lines out. I ran wpa_supplicant again, but I still get Not Connected as a result.

Answer 1

Original WPA used TKIP.

WPA2 uses AES-CCMP.

If your network uses WPA2, you should be specifying AES, not TKIP.