I had a client drop off one of the AP's and this is the error that i see in the logs:
Jun 02 08:17:13.735 apf_80211.c:3942 APF-1-SEND_ASSOC_RESP_FAILED: Could not send a Client Association response to 00:15:70:af:c3:62. Supected Auto-Immune attack Not sending Assoc Response.
What does it mean?