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I looked further into this and have found the underlying issue affecting us. We use RSA Security with the built in RADIUS Server. Appears that the RSA Server accepts only Clear Text Passcode strings, but the HTTP Management passes the authentication ...
The configuration that has been keyed in from the CLI has been removed, and using the WEB interface, the Admin Security has been applied. The AP is now configured to use an External RADIUS Server with the IP Address, PORTS and Shared Secrets defined....