WAP Error Message Received invalid EAPOL-Key MIC (msg 2/4)

Hi there
can anyone help me with this error message Received invalid EAPOL-Key MIC (msg 2/4) .
Time Stamp
Severity
Service
Description
Nov  5 2012 15:11:27
warn
hostapd[4365]
Received invalid EAPOL-Key MIC (msg 2/4)
I only get this message from one device when connecting to the WLAN.
This happens only from time to time. Sometimes it connects without any problem.
Appriciate any help.
Sincerely
Patrik

This is an error when the STA (the computer) constructs the packet. 2/4 is indicate of the handshake process where it sends a nonce-value with its own MIC. A MIC is a message integrity check (or code).
Basically, this error is saying, whatever that computer is sending is invalid. You can try to make the AP behave differently such as force the use of AES instead of AES+TKIP depending on what product you have. Pretty much removing "mixed" wireless networking. As example, try using WPA2 (AES) only.
Such errors are more common using TKIP since it is the nature of TKIP to send a per-packet-key.
-Tom
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