Strange username in failed attempt log in ACS

[sirote]

I have an access point configured to use dot1x (MS-PEAP) which authenticates against ACS. Everything work fine, but there are some strange logs appearing in failed attempts. I think it is some sort of misinterpretation in ACS.

My ACS is 4.1

My access point is AIR-AP1231G version 12.3

I also have attached the logs. Hope anyone can help me clarify this.

[vkapoor5]

This document provides a sample configuration for LEAP or MAC authentication.

Note: This guide assumes the most basic configuration. It does not cover configuration of more advanced encryption modes such as Cisco Key Integrity Protocol (CKIP) and Cisco Centralized Key Management (CCKM).

http://cisco.com/en/US/products/sw/secursw/ps2086/products_configuration_example09186a00805e7a13.shtml