Hostapd : invalid MIC in msg 2/4 of 4-Way Handshake

Vivien Berger vivien.berger at gmail.com
Tue Mar 13 13:19:37 EDT 2007


Hi,

I have hostapd 0.5.7 working with with my D-link DWL-G650 network card (with
mad-wifi 0.9.2.1 dwifi driver).

I have the  following problem when I try to connect a device to this AP :
invalid MIC in msg 2/4 of 4-Way Handshake

this is an extract from hostapd ouput:

ath0: STA 00:14:a7:fa:8c:ed IEEE 802.11: associated
  New STA
ath0: STA 00:14:a7:fa:8c:ed WPA: event 1 notification
madwifi_del_key: addr=00:14:a7:fa:8c:ed key_idx=0
ath0: STA 00:14:a7:fa:8c:ed WPA: start authentication
WPA: 00:14:a7:fa:8c:ed WPA_PTK entering state INITIALIZE
madwifi_del_key: addr=00:14:a7:fa:8c:ed key_idx=0
ath0: STA 00:14:a7:fa:8c:ed IEEE 802.1X: unauthorizing port
WPA: 00:14:a7:fa:8c:ed WPA_PTK_GROUP entering state IDLE
WPA: 00:14:a7:fa:8c:ed WPA_PTK entering state AUTHENTICATION
WPA: 00:14:a7:fa:8c:ed WPA_PTK entering state AUTHENTICATION2
WPA: 00:14:a7:fa:8c:ed WPA_PTK entering state INITPSK
WPA: 00:14:a7:fa:8c:ed WPA_PTK entering state PTKSTART
ath0: STA 00:14:a7:fa:8c:ed WPA: sending 1/4 msg of 4-Way Handshake
WPA: Send EAPOL(secure=0 mic=0 ack=1 install=0 pairwise=1 ie_len=0 gtk_len=0
keyidx=0 encr=0)
TX EAPOL - hexdump(len=113): 00 14 a7 fa 8c ed 00 13 46 98 00 84 88 8e 02 03
00 5f fe 00 89 00 20 00 00 00 00 00 00 00 01 7c b5 33 92 2a e4 67 0d 04 80
41 fc 1d 8a 1d 6b c6 55 d8 1d d8 5b a9 40 b8 cb 24 3d 92 a2 2c 8b 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
IEEE 802.1X: 123 bytes from 00:14:a7:fa:8c:ed
   IEEE 802.1X: version=1 type=3 length=119
ath0: STA 00:14:a7:fa:8c:ed WPA: received EAPOL-Key frame (2/4 Pairwise)
WPA: 00:14:a7:fa:8c:ed WPA_PTK entering state PTKCALCNEGOTIATING
PMK - hexdump(len=32): [REMOVED]
PTK - hexdump(len=64): [REMOVED]
ath0: STA 00:14:a7:fa:8c:ed WPA: invalid MIC in msg 2/4 of 4-Way Handshake
ath0: STA 00:14:a7:fa:8c:ed WPA: EAPOL-Key timeout
WPA: 00:14:a7:fa:8c:ed WPA_PTK entering state PTKSTART
ath0: STA 00:14:a7:fa:8c:ed WPA: sending 1/4 msg of 4-Way Handshake

Does anyone know why ?
Thanks.

ZorteK
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