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Why did authentication for WLC with the use radius on ACS fail, and why did ACS not show any failed attempts?

April 26, 2017ACS authentication fail failed radius wlc

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Why did authentication for WLC with the use radius on ACS fail, and why did ACS not show any failed attempts?

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A. An issue exists with ACS 5.0 and WLC interoperability before the patch 4. Download patch 8, and apply the patch on the CLI. Do not use TFTP to fix this issue.