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Has anybody solved this? I am breaking my head over this currently. Thanks

[The valid lifetime (lease timer)]

The valid lifetime (lease timer) is set to 4000 by default.  I feel that's too low.  I'm running 7200.  That said, I tried something like 28800 and a bunch of my IoT devices (camera, alarms) lost their leases and couldn't reconnect.  I checked the leases, and the clients were reporting a 0 lease timer.  I'm guessing the IoT devices are hard-coded to some lower number and they don't understand the longer lease time.

Stumbled upon your post here while searching for Kea default lease time. Ironically, what I really wanted to search for was the issue that you mentioned, which I am experiencing, too. I had sent my lease time to 83,000 and all of a sudden IOT devices refused to reconnect. Thank you so much for posting this.