Hi Kraishak In addition to Darren's excellent suggestion to enable debug logging, you write that the number of "max-unacked-clients" reached 14 during your testing. I wonder if this could be because Kea was waiting for the next "ha-heartbeat" before transitioning.
Could you retry your test and wait until the next failed "ha-heartbeat" command? There is an open Kea GitLab issue that describes this situation. "partner-down state transition when max-unacked-clients reached" https://gitlab.isc.org/isc-projects/kea/-/issues/2592 Also, check that your testing software correctly updates the "secs" field in retries. Kind Regards Peter
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