HA Preemption and Session Syncronization - you need HA2

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HA Preemption and Session Syncronization - you need HA2

L1 Bithead

For whatever reason I didn't see the need to configure HA2. But while testing HA I could not get preemption to work. I read everything I could find online and got frustrated that it would not let the designated firewall take back control automatically. I read the system log and bit more closely and found this entry:

"HA Group 1: Ignoring session synchronization due to HA2-unavailable; preemption waiting for session synchronization"

I cannot find single reference online to a connection between session sync and preemption but there you have it. Just thought I would save the next bozo like some face palming by posting this. Good luck!


Cyber Elite
Cyber Elite



This may be a useful reference article for all things that are synched over each HA interface:


High Availability Synchronization



preempt does require a fully synced session table as it is designed to gracefully reset to the desired active member after it has been unavailable, the absense of a synced session table would cause a majopr network disruption as all active sessions would be disrupted

Tom Piens
PANgurus - (co)managed services and consultancy

L5 Sessionator



No HA2 mean no session synchro then all running session wil be dropped in case of HA. It's ... less transparent for user 😉

No HA if you don't have HA2 ... strange. What are you failover condition ?






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