CCTV Camera Pros Viewtron Video Surveillance DVRs - HD-SDI and Standard Definition CCTV Recorders - Manual (Page 23)

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DDNS
Automatic Setup of DDNS while connected to the Internet
In [Advanced Setup>Network>DDNS setup], users can set this up manually as well.
Error Status
Router does not support UPnP and Port-forward.
Unknown Gateway.
Gateway is not connected to the Internet
Gateway is not connected to the Internet or connection test failed
Connection Test – Connection Test Server is running. It automatically tests the connection
from DVR to external servers and displays the test results.
Storage Status
Can check Backup Storage Status like below.
No HDD found or not formatted.
Rewriting
One can check Storage on each Device as shown above,