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

[patrik.keller]

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

[Tom Watts · Accepted solution]

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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[patrik.keller]

Hi Tom

thank you for the quick reply.

It helped in some way. The log entrys are not as many as before. But it still happens from time to time.

Is there an other twaek in the settings I could try?

Take care

Patrik