@R1D2 Actually i want to use Controller as DHCP for ap and the option you provided is for external dhcp such as L3 switch or windows dhcp server which i want to use for clients only. Further it works...

@R1D2 Yes did. evenafter the first reboot only two devices dissapear and then on second reboot all devices dissapeared and not coming back. and now AP's are not even working and not allowing client...

I configured my newly purchased AC500 wireless controller with 5 CAP 1200 AP's and every thing works fine unless i rebooted the controller. All the AP's disappeard from the AP status page in...