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we have Enterprise Wireless Solution as WAN and have two Controllers ( WS-SVC-WISM2-K9 ) with more than 500 AP ( Cisco 1602 ) and Access point connect to solution across ISP modem .
but we have the below Random problem occurred as :
1- the AP is up and joine the Controller but When the user choose SSID , he can’t connect to SSID and shown (connection failed & WIFI_network saved) and no Clint associated with AP in the Controller .
2- the AP is up and joine the Controller the AP publish SSID but the problem shown as attached file "Authentication Failed Occurred" and no Clint associated with AP in the Controller .
and We restarted modem & AP more than one time and but
thanks for your help .
Duplicate post, see below