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NSE4 · Question #37

What are the requirements for a HA cluster to maintain TCP connections after device or link failover? (Choose two.)

The correct answer is A. Enable session pick-up. D. Connections must not be handled by a proxy. To ensure TCP connections persist after a FortiGate HA cluster failover, session pick-up must be enabled, and the connections must not be processed by proxy-based services.

Submitted by klara.se· Apr 18, 2026FortiGate Deployment and System Configuration

Question

What are the requirements for a HA cluster to maintain TCP connections after device or link failover? (Choose two.)

Options

  • AEnable session pick-up.
  • BEnable override.
  • CConnections must be UDP or ICMP.
  • DConnections must not be handled by a proxy.

How the community answered

(38 responses)
  • A
    92% (35)
  • B
    3% (1)
  • C
    5% (2)

Why each option

To ensure TCP connections persist after a FortiGate HA cluster failover, session pick-up must be enabled, and the connections must not be processed by proxy-based services.

AEnable session pick-up.Correct

Enabling session pick-up allows the FortiGate HA cluster to synchronize active session states between the master and slave units, enabling the new master to seamlessly take over existing TCP connections during a failover.

BEnable override.

Enabling override influences the HA master election process but does not directly contribute to session persistence or pick-up.

CConnections must be UDP or ICMP.

The question specifically asks about TCP connections, which are stateful; UDP and ICMP connections are handled differently and are not the primary concern for session pick-up due to their connectionless nature or limited state.

DConnections must not be handled by a proxy.Correct

Connections handled by proxy-based services (e.g., explicit proxy, certain deep inspection) are terminated and re-established by the FortiGate, which prevents the original TCP session from being picked up by the new master during a failover.

Concept tested: FortiGate HA session failover, session pickup

Source: https://docs.fortinet.com/document/fortigate/7.4.0/administration-guide/52671/session-pickup

Topics

#HA#Session Synchronization#Failover#Proxy Mode

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