Do you have your network and cams setup to be secure from the net?
UPNP off, Cams/nvr blocked at the router from contacting the net,no ports forwarded, etc?
Read this: Dahua latest stable firmware + Best Practice Reminder
The NVR has access to the net for push notifications. But I have disabled UPNP, no port forwarding setup. The cams are on the NVR network with the built in POE switch. I VPN in to check the cams. I'm going to pull the cams tonight to see if I can connect to them. Is there a factory reset button inside the camera?