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ACS5 : Invalid EAP payload dropped

Hello,

Moving the authentication of our Wifi from an ACS express on WLSE to an ACS5.0 prevent any user to connect. the error message on the ACS 5 is :

101 Invalid EAP payload dropped.

Internal error, possibly in the supplicant: Could not validate an EAP payload. Silently dropping it.

Supplicant : IBM Access connection

AP : Cisco 1130

Authentication EAP/PEAP/Ms-Chapv2

I try changing doing the same connection with the Microsoft supplicant it works !

Seems that the problem occurs between IBM AccessConnection and ACS5

Is it a known problem ? is there some solution ?

Thanks

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