MFP Anomaly

Unanswered Question
Jan 9th, 2008

Ever since upgrading my 4404 and WiSM controllers, I keep getting a bunch of MFP errors like the one below. Is anyone else seeing the same thing ? I have MFP set to optional. It is occurring in multiple cities.





MFP Anomaly Detected - 582 'Invalid MIC' violation(s) have originated from the AP with BSS '00:1c:0e:40:ba:6f'. This was detected by the radio with Slot ID '1' of the AP with MAC '00:1a:e2:10:e0:80' when observing 'Beacon, Disassociation, and Deauthentication' frames.

I have this problem too.
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rob.huffman Wed, 01/09/2008 - 19:43

Hi Randy,

Just thought you might want to see this recent post where these same errors are ocurring after an upgrade to Maybe you could piggyback on this TAC Case;

Hope this helps!


rduke Thu, 01/10/2008 - 06:01


Actually that was my post, but thanks anyhow. I did talk to Cisco about it yesterday since they were slow about getting back to me. I had the call open since Dec 13th, but they said they are working on it so maybe we will see a fix. In the meantime the workaround is to turn off MFP if you don't want to see the errors.


rob.huffman Thu, 01/10/2008 - 11:21

Hi Randy,

Sorry about that my friend! My eyes must have been half-closed when I sent that. My appologies :)

Take care,


psiegling Fri, 04/11/2008 - 11:36


Have you been getting calls from users regarding loss of connection to the APs on the wireless network?

We upgraded to 4.2.217 on our 4404 WLC two week ago. The MFP messages started showing up then. Also, users are only able to stay attached for about 30 min. The must manually reconnect.

Thank you,


s.clinard Mon, 08/04/2008 - 12:07

Hi Phil,

I was curious if you were still having issues with wireless clients staying connected for longer than 30 minutes? I am currently having a similar issue however I am not sure if it is really the same. Clients with certain Intel chipsets lose their DHCP information after 30 minutes (half of the 1 hour lease) and they have to disable/enable the wireless connection in order to reconnect.


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