If getting Log-in failed on the DMSS app, at the video recorder location (LAN) make sure the mobile device's Wi-Fi is turned off, or use the internal IP address to set up the device. This is the most common cause; use of the external IP will not work when on the same network (for most routers). Passwords are also case sensitive. Check to make sure the password is entered correctly. Do not put the device IP address in the Name entry and do not include any hypertext markup (HTTP://) or the HTTP port after the address. If using a DDNS host to access the device remotely, make sure the DDNS is functioning properly (test on a browser) and also check to make sure the ports are forwarded correctly for the device.
For assistance on networking devices, please visit the Networking page for more info.