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NAC Wireless OOB using VPN-SSO Not working out so well

Dilema

If I have 4 5508 wireless lan controllers being serviced by 3 NAC Servers (ha ha)

WLC configuration will allow me to put in all 3 NAC Servers in the radius accounting field for VPN-SSO functionality.

Radius acct updates allow sso through the CAS … BUT the wlc will only notify the first nac server in the list as radius acct entry 2 and 3 will only be forwarded if Acct packets timeout to the first.

Now VPN-SSO will only work if the client uses the first nac server and the other 2 are now manual auth only.

What is the solution folks?

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