:" NAS duplicated authentication attempt " message on ACS

Unanswered Question
Oct 22nd, 2007
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Hi guys ,

I am facing some problem with my Wireless solution .

My wireless soultion contains a WLC and 10-15 AP's.

1)I am using DNS methods for getting the WLC ip address for the AP's (mapping the FQDN

CISCO-LWAPP-CONTROLLER.aja.win.ml.com to the WLC ip address on the DNS server ).And this is working fine for me .

2)When i am trying to connect my laptop to the Wirless network i am getting the PC's MAC listed on the WLC and it is

trying to authenticate from the ACS as well

3)But i am seeing the ACS logs the following error :" NAS duplicated authentication attempt " and it keep on going .

I realy stuck here since i am not sure what is this meant by .So please help me out if some one

got this problem some where before .

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Overall Rating: 3 (1 ratings)
Jagdeep Gambhir Tue, 10/23/2007 - 06:30
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Please go to ACS > System Configuration > Global Authentication Setup > Under PEAP uncheck "Enable Fast Reconnect:" option > Submit + Restart.

Please apply following Windows patch on WindowsXP SP2 clients, if you want to use Enable Fast reconnect option on ACS server.

Execute "WindowsXP-KB885453-x86-enu.exe" file in the zipped file.



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aravindas Tue, 10/23/2007 - 21:38
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Hi JG ,

I had applied the patch on my Laptop .

I seeing some changes on the ACS's logs now .

Before installing the patch it was continously failing saying "NAS duplicated authentication attempt "

I thing we have to get :"Re-key OK" also for the sucessfull authetication .That i am not seeing on the logs .

10/24/2007 13:30:47 Authen OK AYA\user wireless 00-1B-77-95-62-AE 29

10/24/2007 13:28:37 Authen OK AYA\user wireless 00-1B-77-95-62-AE 29

10/24/2007 13:26:26 Authen OK AYA\user wireless 00-1B-77-95-62-AE 29

10/24/2007 13:26:09 Authen OK host/ESINLTECH00710.aya.win.sl.com wireless 00-1B-77-95-62-AE 29


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