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I have a WLC (4404), and it is configured for authentication in ACS.
When I conect in WLC whit browser (HTTPS), I put my username and password from ACS, and it works.
However, if I put the local username in WLC it works.
I would like to disable the username local when ACS works, as I do that?
But when ACS go down a need of the local username...
You will not be able to do this like how you can with a router or switch. Locally is checked first prior to tacacs and can't be changed. Maybe speak with you local Cisco wireless SE to see if he can put that as a feature enhancement.