I'm hesitant to mention it for fear of muddying the waters, but the tunnel has worked twice during my testing, with this same configuration. There is no NAT involved here, and no firewalls between these devices. IKEv2 Negotiation aborted due to ERROR: Failed to receive the AUTH msg before the timer expired The only suspicious thing I can find is this message in the Cisco logs: Apr 7 13:08:35 %ASA-4-750003: Local:9.8.7.6:500 Remote:2.3.4.5:500 Username:Unknown The settings all look correct to me, and the tunnels show up on both sides (see note below) but no traffic passes between networks. Trying to move from pfSense to Mikrotik for an office router, and the only stumbling block is maintaining a site-to-site IPSEC tunnel between it and our Cisco ASA.
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