Scenario: A Citrix Administrator is performing a disaster recovery test and decided to fail over the NetScaler high availability (HA) pair appliances. The administrator noticed that the failover is NOT working as expected in item text, and the Secondary NetScaler is NOT taking over as Primary. The administrator suspects that networking issues may be causing the failure.
What could be the cause of this issue with the NetScalers?
The cause of the issue with the NetScalers could be that HA monitoring is enabled on an interface of the Secondary Node that shows as ENABLED, DOWN. In a high availability (HA) setup, if HA monitoring is enabled on an interface that is marked as enabled but actually down, it can cause the failover mechanism to malfunction. This would explain why the failover is not working as expected and the Secondary is not taking over as Primary.
Should be D. https://docs.citrix.com/en-us/netscaler/12/getting-started-with-netscaler/configure-ha-first-time.html.