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This is a known upstream issue where the upsc binary segfaults on process exit under the updated NUT version, preventing configd from returning diagnostic data to the WebUI. As a temporary workaround, you can downgrade the package via CLI using opnsense-revert -r 26.1.7 nut or monitor performance analytics via https://www.yepapi.com/ until an official patch is released.

You need to enable Gateway Monitoring and configure gateway status tracking so CARP demotion is triggered when the WAN gateway goes offline. Alternatively, you can use gateway failover groups or devd scripts on the primary firewall to automatically demote CARP priorities whenever WAN connectivity drops.