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CCMP DecryptErrorsClient is detected (WLSE&AP)

Hi

I saw these errors(faults) in wlse.

And I saw "Decrypt Failed" in AP

Does anyone know why these fault appear?

How does "Decrypt Failed" occur?

in WLSE

---------

Fault Summary

Type: Client_stat 000d0bXXXXXX **SSID**

Description:CCMP DecryptErrorsClient is detected (cnt: 2)

Severity: P2

Timestamp: Active 02:51:10 10/23/2009

---------

in AP

--------

HOSTNAME#show dot11 associations all-client

Address : XXXX.XXXX.XXXX

Name : NONE

IP Address : YY.YY.YY.YY

Interface : Dot11Radio 0

Device : unknown

Software Version : NONE

CCX Version : NONE

State : EAP-Assoc

Parent : self

SSID : *************

VLAN : 81

Hops to Infra : 1

Association Id : 37

Clients Associated: 0

Repeaters associated: 0

Tunnel Address : 0.0.0.0

Key Mgmt type : WPAv2

Encryption : AES-CCMP

Current Rate : 48.0

Capability : WMM ShortHdr ShortSlot

Supported Rates : 1.0 2.0 5.5 6.0 9.0 11.0 12.0 18.0 24.0 36.0 48.0 54.0

Signal Strength : -64 dBm

Connected for : 74579 seconds

Signal Quality : N/A

Activity Timeout : 25 seconds

Power-save : Off

Last Activity : 35 seconds ago

Packets Input : 103944

Packets Output : 12239

Bytes Input : 7375508

Bytes Output : 8153308

Duplicates Rcvd : 4607

Data Retries : 2952

Decrypt Failed : 5

~~~~~~~~~~~~~~~~~~~~~~

----------

in this FAQ, I can understand Fault in wlse appeared because I use IDS setting in WLSE.

But I can't set "threshold" in wlse (IDS > Manage IDS Settings > CcmpDecryptErrorsClient)

I can only set polling time.

http://www.cisco.com/en/US/docs/wireless/wlse/2.12/troubleshooting/guide/faults.html

And I can't understand why this "Decrypt failed" occur.

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