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I am also having this problem with only the Aironet 1600 series APs in our environment. We're using EAP-TLS and everything looks configured correctly, all clients have the cert installed, but it will not connect to the Aironet 1600s.
I'm having this issue as well, and we have 5 1602i series APs in autonomous mode.I tried setting the 5 GHz radio to 40-above as suggested, but the AP was unaffected. I factory reset an AP and tested it again with 15.2.4-JB6 IOS and it gets expected t...