[Kea-users] Intermittent "Address already in use" Error When Creating DHCP Reservations (Micetro 25.2.1, Kea 2.6.4)

[Zenz, Thomas]

Dear ISC KEA Community,
We're encountering an intermittent issue when creating DHCP reservations in our Micetro environment (version 25.2.1) running on Kea (2.6.4) in a high-availability (HA) setup.
The same request succeeds at times but fails unpredictably with the following server response:

{'error': {'code': 5376, 'message': 'Error creating a reservation: Unable to update the configuration due to an error: Error initializing hooks: CmdHttpListener::run failed: unable to setup TCP acceptor for listening to the incoming HTTP requests: bind: Address already in use.'}}

The HTTP response code is 400 (Bad Request), which is misleading since the request itself is valid (identical requests succeed at other times).

Additional observations:

  *   During the failure, the primary server appears to be in standby mode (as if it were the secondary).
  *   The only workaround we've found is manually running keactrl reload on the primary server to restore normal operation.
Our logs suggest the issue stems from a resource conflict (e.g., TCP port exhaustion or a lingering listener), but we're unsure how to diagnose or resolve it.
Has anyone encountered this behavior before? Any insights or troubleshooting steps would be greatly appreciated.
Thank you in advance!

Tom

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