For our network we have a DSL modem from our ISP. The modem connects to an ASUS RTN66U router. The router connects to the switch to which are connected about 30 computers including the file server running Windows SBS Server 2003. The ASUS router manages DHCP. We also have had a Unifi AP access point Wifi unit connected to one of the ASUS router switch ports. This worked fine until we had a lightning strike. The lightning took out a number of items including, it seemed, the Unifi AP. So I bought another Unifi AP. But I cannot get the Unifi controller software to discover it. I get the message "No devices have been discovered. Make sure the devices are on the same L2/switch network and try again." I know it needs Java. I tried uninstalling Java and uninstalling the Unifi controller software, rebooting the computer, install Java, install the Unifi controller software. Still not. I am doing this on one of the work stations which is connected to the main switch. In most of my efforts the computer which is hosting the Unifi controller software was connected to a small switch which is connected to the main switch. Just now I tried removing the small switch from the picture. I have tried suspending my AVG antivirus. I have tried suspending the Windows firewall on my Unifi controller computer. I have tried suspending the firewall on the ASUS router. I have tried resetting the Unifi AP to factory default by holding the button more than 5 seconds. What should I try next?