Hi, i recently had this problem and its driving me crazy.  i was able to connect with my computer to the antminer s9 and do the setup and all.  one day i went to check on the machine and i couldnt get to it.  the page times out and no response.  i have tried deleting cookies, different browsers, changing my ip address, reinstalling different browsers, i tried pinging the antminer and no response.  i have checked all firewall and even disabled them and nothing.  the machine is still registered on my router with the same ip and it is mining.  my friend came over with his laptop and on his computer we can navigate to the antminer no problems.  he can ping the miner no problem.  does the antminer have a firewall or can it somehow block my computer from accessing it?  i cant find this problem on any forum.  anyone have any ideas?