Scenario: A Citrix Administrator manages an environment that has a NetScaler high availability (HA) pair running on two MPX appliances. The administrator notices that the state of the Secondary NetScaler is Unknown and moves the Secondary NetScaler to a new switch as a result. Also, the administrator captured a packet trace on both NetScalers. Both sent traffic on secure port 3009 and were routing back and forth to each other.
What is causing the Secondary state to be Unknown?
The correct answer is that the remote procedure call (RPC) nodes are NOT configured correctly. For NetScaler high availability (HA) to function properly, the communication between the nodes must be configured correctly using RPC. If the state of the secondary NetScaler is unknown and a packet trace shows that secure traffic is sent but not processed correctly, it is likely due to incorrect RPC node configuration. If RPC is not set up correctly, the nodes will not be able to communicate effectively, leading to the observed issue.
Should be D. https://support.citrix.com/article/CTX116748
D i correct answer
D. It does not mention that HA is configured on different subnets. Therefore HA is done using the same VLAN between the appliances. the only way that HA does not form is that rpcNode is configured wrong.