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Palo Alto Networks Certified Network Security Engineer (PCNSE) · Palo Alto Networks
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This is VERY close to a PCNSE practice question. The answer there for the HA4 timer is: The maximum interval between hello packets that are sent to verify that the HA functionality on the other firewall is operational. From the HA links section of the PCNSE Study Guide: HA cluster members use an HA4 link and HA4 backup link to perform session state synchronization. HA1 (control link), HA2 (data link), and HA3 (packet-forwarding link) are not supported between cluster members that aren’t HA pairs.
B (Optional) Change the HA4 Keep-alive Threshold (ms) to specify the timeframe within which the firewall must receive keepalives from a cluster member to know that the cluster member is functional; range is 5,000 to 60,000; default is 10,000.
https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/high-availability/configure-ha-clustering