topic Re: WPA-AES - Decrypt Errors in Wireless

WPA-AES - Decrypt Errors

rcoote5902_2 — Sun, 04 Jul 2021 00:46:12 GMT

Hi,

After seeing some TKIP-MIC errors for a few wireless clients and reading the benefits of AES over TKIP I switched our encryption to WPA-AES.

The majority of our clients have migrated well, however I am seeing a lot of decrypt errors on the wireless controllers.

"Decrypt errors occurred for client 00:21:63:ba:af:9f using WPA key on 802.11b/g interface of AP 00:1f:ca:82:c9:70"

It's not a particular machine, but rather a large number of them. They appear to be associating and authenticating but the trap log is filling quickly with a large number of these errors.

I'd prefer to stay with AES, but TKIP gave me a lot less errors. 🙂

We're using:

Cisco 4404 WLC's

Cisco 1131AG LWAPP's

RADIUS Authentication via Microsoft IAS

PEAP Authentication

WPA-AES

Thanks,

Rob

Re: WPA-AES - Decrypt Errors

CFayNTAdmin83 — Thu, 02 Jul 2009 11:44:39 GMT

Wow, small world. I have the same behavior on my network.

I'm running the following...

-Cisco 1242's , LWAPP

-4402 WLC, 4.2.205.0

-MS IAS / RADIUS service

-Funk OAS RADIUS

-WPA2-AES

-PEAP MS-CHAPv2

Re: WPA-AES - Decrypt Errors

cchitwood1 — Tue, 07 Jul 2009 13:57:32 GMT

I have seen this also, make sure your clients are running the latest version of the WLAN NIC drivers. We've found PEAP support to be improved with every new version of software.