This is a Bitcoin mining support board and you are asking about LTC or doge miner.
You must move this thread to
altcoin mining sectionAnyway, about your case, have you tried to access it with a different device and browser?
If not, try it first. If it doesn't work, then try to reset the unit to factory default and reflash the unit with firmware.
If it still doesn't work try to clean the ethernet terminal with isopropyl alcohol and test it again.
If any of these doesn't work then remove all hashboard first and test them with your extra miner by swapping the control board.