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Post your wlan, policy profile and ap join profile config from show run for analysis, its difficult to say what is wrong without seeing the current config.
to be precise, the "bombardment" with telemetry data essentially starts as soon as you add WLC and Catalyst center. I called it that because its a huge amount of data being streamed at all times (a bit less when there is no clients on WLC)These perio...
rule 65 and 80 in your ACL are not needed. Try removing them. Compare with the:https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/213920-central-web-authentication-cwa-on-cata.html#toc-hId-881505252Besides t...