Enabling NTP time synchronization
Since the TOTP solution is based on limited-duration codes, the date and time on the SNS firewall must be accurate. To guarantee optimal operation, you are strongly advised to enable NTP time synchronization.
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Go to Configuration > System > Configuration, General configuration tab.
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Under Date/Time settings, select Synchronize firewall time (NTP).
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Ensure that you have the correct time zone, and change it if necessary.
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Under List of NTP servers, you can keep the NTP servers entered by default or change them according to your preferences with the Add and Delete buttons.
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If keys are needed to access the NTP servers, you can add keys under List of NTP keys, then associate them with the NTP servers under List of NTP servers.
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Click on Apply.
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A message will prompt you to restart the SNS firewall. Click on the
icon in the upper banner, then on Restart now.
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Once the SNS firewall has restarted, in Configuration > System > Configuration, General configuration tab, under Date/Time settings, check whether the date and time on the SNS firewall are accurate.