QNAP Security VioStor NVR (Version: 4.1.1) - Manual (Page 221)

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6.7.11 Advanced System Settings
Set the timeout period to log off the users from the configuration page of the NVR when the
idling time has reached.
To allow guest access to the monitoring screen of the NVR by local display, select ‘Enable
anonymous access’.
Note: The timeout logoff does not apply to the monitoring, playback, advanced mode,
device configuration, system update, remote replication, and logs & statistics pages.
Maximum number of concurrent logins (http): You can define the maximum number of http
user sessions at the same time, up to 32.
Network intrusion detection: The system will alert users when possible attacks from the
network are detected and give recommendations.