Scenario: A Citrix Administrator manages an environment that has a Citrix ADC high availability (HA) pair running on two MPX appliances. The administrator notices that the state of the secondary Citrix ADC is ‘Unknown’.
What is causing the secondary state to be ‘Unknown’?
The state of the secondary Citrix ADC being 'Unknown' is most likely caused by the synchronization on the secondary appliance being disabled. If synchronization is disabled, the secondary ADC cannot communicate its status with the primary ADC and update configuration changes properly, resulting in the 'Unknown' state.
The synchronization on the secondary appliance being disabled is the most likely cause of the secondary ADC being in an 'Unknown' state. Without synchronization, the secondary ADC cannot properly communicate its status and synchronize configuration changes with the primary ADC, leading to its state being reported as 'Unknown'.