Possible Cause of Cisco WLC Policy Manager State Error

C.

The issue described in the question is related to central web authentication not working on Cisco WLC. The policy manager state is showing "RUN" for new clients instead of "CENTRAL_WEB_AUTH." The most likely cause of this issue can be identified by eliminating options that are unrelated or incorrect.

Option A, "The Web Login Page under the Cisco WLC security settings should be set to External (Redirect to external server)," is a possible cause for central web authentication failure. This is because, in a central web authentication setup, the user is redirected to a web login page hosted externally. If the web login page is not set correctly, the user may not be redirected to the correct page and the authentication may fail.

Option B, "The WLAN NAC State should be set to RADIUS NA," is not a likely cause for this issue. WLAN NAC (Network Access Control) State refers to the authentication state of the WLAN client. This option does not affect the policy manager state.

Option C, "The WLAN Layer 2 security should be set to WPA+WPA2," is also not a likely cause for this issue. WLAN Layer 2 security refers to the encryption method used to secure the wireless network. This option does not affect the policy manager state.

Option D, "The WLAN Layer 3 security should be set to Web Policy with Conditional Web Redirect," is a possible cause for central web authentication failure. This is because central web authentication relies on a web policy and a conditional web redirect to authenticate the user. If the WLAN Layer 3 security is not set correctly, the user may not be redirected to the web login page and the authentication may fail.

In conclusion, based on the information given, option A or D is the most likely cause of the central web authentication failure.