@Leohuangdi
Hey How you doing mate?
I am using same KPD679-D and i want little help from you.
I have forwarded 80 port of DVR via Wifi Router on internet, i was accessing cameras on internet through 4 Users including admin account. But right now i am unable to login via any of the username accounts that i set. I don't know what has happened to DVR. Its giving authentication error. How can i reset password of DVR?
Waiting for prompt reply from Avtech Expert.