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Topic # 14390 1-Jul-2007 19:29
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Any noticed this occurring? I'm seeing it every now and then today on my WPA PSK wifi network.

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  Reply # 76648 2-Jul-2007 20:04
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Check your system log around the time this message pops up, and see if you have and entry something similar to this:

kernel[0]: AirPort: Message Integrity Failure detected (G)
kernel[0]: AirPort: MIC Failure -- activate countermeasures

For some reason (maybe genuine, maybe not) OS X has detected a potential brute force attempt on the wpa message integrity code (MIC).

For the gory details have a look here:

I don't know of anyway of disabling this "countermeasure"

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  Reply # 78112 14-Jul-2007 19:36
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I have never seen that before. How often does it happen?

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