Peculiar error from WLC and LWAP locking out iPhone 6+

Question

WiFi LAN:
WLC Cisco 2504 Software Version 8.0.100.6
LWAP's Cisco 1702i's Software Version IOS 15.3 Mini IOS 8.0.72.236
Single WLAN using WPA2 (AuthPSK)
Apple iPhone 6+ Software Version 8.1.2
The error being reported in the 2504 WLC Message Log is:
"*sntpReceiveTask: Jan 21 10:59:27.457: #LWAPP -3-DUP_IP:spam_Irad.c:39857 The system has added client a8:8e:24:60:a0:52 to exclusion list due to IP Address conflict of AP 192.168.10.10, this is a duplicate of IP on another machine (MAC a8:8e:24:60:a0:52)"
In the error above:
a8:8e:24:60:a0:52  - Is the Smart Phone being locked out of the LAN.
192.168.10.10 - Is the IP address of the LWAP where the problem started yesterday.
To troubleshoot, I took the smartphone to another LWAP 100 meters away and the above error still gets reported to the 2504 WLC.
My questions to the support community:
1) I have looked everywhere for this "Exclusion List" on the 2504 WLC GUI and cannot fine it. Does it exist on the 2504 GUI? CLI?
2) If not, is it on the LWAP?
My thinking is to clear this list to see if this smartphone can then join the LAN.  THX

Answer 1

Thanks for that Scott. I will do the updates when a window opens up. I performed the opened SSID as you suggested and the smartphone would not join on the first attempt. On the second attempt I manually entered network settings and it finally joined and has held for over an hour now. I have 2 iPhone 6 smartphones with this problem now and 45 mixed iPhone 6's/Droids running flawlessly with WPA2/AES Security. I will attach a couple screenshots of the security setup to this post. 
On another note, I had originally though that this was an Apple IOS 8 issue as I found a recent thread on the Apple Support Communities mentioning the same issue of continuous re-logging in.
https://discussions.apple.com/thread/6536955