Friday, October 20, 2017
Cisco Wireless APs fail to associate to the controller.
We had an issue with a 1200 series lightweight AP not associating with a 2100 series wireless controller. During investigation and I found a certificate error associated to the LWAP join request. Because I had the flexibility to do so, I thought "let's reboot the controller and see what happens". After reboot none of the APs were associating and all were having the same error. Not a good result.
I discovered this article
In addition, without an upgrade and certificate check disable, a quick fix to get the APs associated is to change the date. Simply disable NTP on the WLC and set the date back a few years. The APs associated right up and everything started working.