Details
Secure Access Only should be Enabled. When you select Secure Access mode, Citrix ADM communicates in secure mode, that is, it uses HTTPS protocol.
Solution
Configuration > System > Administration > System Configurations > System, Time zone, Allowed URLs and Message of the day
Update the value for Secure Access Only to Enabled.
Supportive Information
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: System and Communications Protection.This control applies to the following type of system Citrix_Application_Delivery.