for future people that will have this issue :
your dhcp probably got changed, refresh your router's page or download this https://enshop.bitmain.com/support.htm?pid=00720160906053730999PVD2K0vz0693     make sure your computer is connected to the same router that the machines are connected to in order to use that program. click the big start button then hold the ip check button on front of the miner(which should be the only button you can press) for about 5 to 8 seconds then an ip address page will appear. If you're still getting this problem then get a paperclip and hold down the reset button I'd say for 10 secs max.