Before any attempt to look at miner via web interface just looking for it with IP Scanner get this.

Click on small triangle to left of ip findings =

HTTP 401 - unauthorized (lighttpd 1.4.32)

Once you goto web interface and try to logon with root root box just keeps asking for id and password.

Any ideas where this comes from?  How to fix?

on a different antminer that is working ip says

HTTP LuCI Lua http config