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This could be an issue with DTLS Flow-Offload, which is a dedicated resource on the FTDs to support VPN connectivity. My FWs randomly rebooted a few months ago and, by the grace of God, I was SSHd into one of them and caught the messages. If you disa...
Definitely try to fix HA first, then upgrade. Cisco has a known issue, like the one in the link below, that causes the HA link to fail, or even worse, split brain and try to send your traffic out of both of your firewalls, which will disrupt the traf...
