Comprehensive and Detailed Explanation From Exact Extract of Forescout Platform Administration and Deployment:
According to the Forescout Resiliency Solutions User Guide and the Forescout Platform Installation Guide, High Availability (HA) requires a license. The documentation explicitly states:
"If your deployment is using Centralized Licensing Mode, you must acquire a valid ForeScout CounterACT Resiliency license. The Resiliency license supports: High Availability Pairing for Enterprise Manager is supported by the Forescout CounterACT See License."
High Availability Licensing Requirements:
According to the official documentation:
Per-Appliance Licensing Mode:
"The demo license for your High Availability system is valid for 30 days. You must install a permanent license before this period expires."
Centralized Licensing Mode:
"If your deployment is using Centralized Licensing Mode, you must acquire a valid ForeScout CounterACT Resiliency license for Appliances, or a CounterACT See License for Enterprise Manager High Availability Pairing."
License Usage Considerations:
According to the documentation:
"You should use the IP address of the High Availability pair when requesting a High Availability license"
"If a license is only issued to the Active node in a High Availability pair, the system may not operate after failover to the Standby node"
"Both nodes must be up when requesting a license"
Why Other Options Are Incorrect:
A. If HA reboots, this is an indication of a problem - According to the documentation, reboots can occur during the setup process: "Following the second reboot in the high availability setup, allow time for data synchronization" - this is normal, not an indication of a problem
B. Set up HA on the Secondary node first - Incorrect order. According to the documentation, "Before you begin setting up the Secondary node Forescout Platform device, verify that the Primary node Forescout Platform device is powered on" - the Primary node must be set up first
C. Connect devices to the network and to each other - While devices must be connected, this is a general infrastructure requirement, not specific to HA setup. The more specific requirement is licensing
D. HA needs to be manually configured on the secondary appliance in order to sync correctly - According to the documentation, the Secondary node configuration uses a setup process that is distinct from the Primary node: "When setting up the Secondary node device, use the same sync interfaces and netmask settings used in the Primary node device" - this is guided setup, not manual configuration for sync
High Availability Setup Process:
According to the documentation:
Set up Primary Node - "Select High Availability mode: 1) Standard Installation 2) High Availability – Primary Node"
Set up Secondary Node - "Set up a device as the secondary node" (secondary node connects to primary automatically)
Licensing - "You must install a permanent license before this period expires"
Referenced Documentation:
Forescout Resiliency Solutions User Guide (v8.0)
Forescout Installation Guide v8.1.x
Forescout Resiliency and Recovery Solutions User Guide v8.1
Set up and configure a device as the primary node
Set up a device as the secondary node