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Clint can’t connect the SSID and showing (connection failed & WIFI_network saved& Authentication Failed Occurred)

Dears

   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

  •          We tested with more than one end-device.  but same problem
  •          We managed the modem and LAN is up and can ping to the controllers
  •          Some times  the AP is flashing (green only).

thanks for your help .

 

 

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VIP Purple
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