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VPN S2S tunnel status shows as Unknown under Site to Site configuration page and monitoring dashboard even when tunnels are up and passing traffic.
Site to Site configured on FMC of version 7.2 or above
None. Check S2S tunnel status from FTD CLI.
This issue is of mismatch/ discrepancy in tunnel status as seen on the FMC (S2S Monitoring dashboard) and the FTD (show commands on device CLI or 'CLI details' tab of FMC's monitoring dashboard). There are various instances of this issue which occur during upgrades, HA operations and other causes. When this problem is hit, the S2S tunnels we see on the FMC's monitoring dashboard and possibly the VPN configuration (listing) page might some times show a tunnel as Inactive/ Down or No Active Data/ Unknown even though the tunnel might actually be Up on the device.
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