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I had made a mistake and had inserted malformed MAC address reserving an IP address for KEA DHCP. Using a - instead a : as a separator the entire DHCP service refused to renew any IP address renewal requests. All of my clients one by one dropped off of the network as a result from that. Log file reported it correctly.
To reproduce it go to services - Kea DHCP (new) - reservations. Click on ADD and in the field MAC address use - io :.
I would at least expect to see a validation check being done to avoid DHCP service to start misbehaving.
Hope this helps.