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I just want to leave a final comment. We had a site-to-site VPN from a Sonicwall TZ470 to Cisco ASA. We kept getting "IKEv2 Received notify error payload" "Invalid Syntax" messages. We verified the IKE phase 1 and phase 2 settings. Finally, I rolled back the firmware image from 7.0.1-R1262.bin.sig to 7.0.0-R906.bin.sig,…