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Assistance with troubleshooting a failover

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Sep 21, 2004
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Last night my ASA 5520's failed over. It appears from the syslogs that both devices began passing traffic. On the secondary unit I see the following message before the failover:
(VPN-Secondary) HA status callback: id=3,seq=200,grp=0,event=406,op=20,my=Standby Ready,pee
r=Failed.

Does anyone know what event ID 406 is or what this error message is an indication of?

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I figured out what was wrong. The event ID indicates that the sequence number for the latest heartbeat did not match the previous heartbeat. So it assumed that it lost all packets between the missing sequence numbers.

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