QNAP Security VioStor NVR (Version: 4.1.2) - Manual (Page 82)

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Connection Message
When the NVR fails to display the video of an IP camera, a message will be shown in the
channel window to indicate the status.
Message Description
Connecting If the IP camera is located on a remote network or the Internet, it may
take some time to establish the connection to the camera.
Disconnected The NVR cannot connect to the IP camera. Please check the network
connection of the computer and the availability of the IP camera. If the
IP camera is located on the Internet, open the port on the router or
gateway.
No Permission No access right to view the monitoring channel. Please login as an
authorized user or contact the system administrator.
Server Error Please check the camera settings or update the firmware of the IP
camera (if any). Contact the technical support if the error persists.