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When we tried connecting ap, its registering to the WLC 5508 with version 188.8.131.52. But it shows operational status as DOWN in WLC and blinking in red,green continuously. If i admin disable it, then it is coming UP and instantly goes DOWN.
see whether you have correct country code configured on your WLC & connected AP is in the right regulatory domain.
Wireless LAN Compliance Status
Post the AP console output to see what's exactly happening.
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Check the compatibility for the WLC and AP country code.
Refer the link for compatibility :http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1300-series/product_data_sheet0900aecd80537b6a.html#Table180211abgnStandaloneAccessPo