Apply NTP authentication, which enables the NTP client (Citrix ADC) to verify that the server is in fact known and trusted.
Configuration > System > NTP Servers > Select Action Dropdown > NTP Parameters
Update the value to Enabled.
Default value: YES
Possible values = YES, NO
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: Audit and Accountability.This control applies to the following type of system Citrix_Application_Delivery.