QNAP Security VioStor NVR (Version: 3.5.1) - Manual (Page 166)

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6.3.4 Host Access Control
Specify the connections to be allowed or denied to connect to the NVR. Choose one of the
following options to restrict the access from a network or an IP address (host) to the server:
1. Allow all connections (Default setting)
Allow the connection from all the hosts to the server.
2. Allow connections from the list only
Allow the connection from the hosts specified on the list only.
Note: When this function is enabled, only the specified IP on the list will be able to find
and connect to the NVR.
3. Deny connections from the list
Deny the connection from the hosts or IP specified on the list.