title: ISC-DHCP-Server stopped running / can't clone pool group
body: <p>I'm using ISC DHCP server to manage the ips in my network at home, I am using version 4.4.1-2.2ubuntu6.1. As OS I am running Ubuntu 21.04.</p>
  <p>On May 28 it stopped working, the service stopped and in the logs I found &quot;Can't clone pool group&quot;. As I haven't changed anything in the config I though at first that an update was the culprit but I wasn't able to find anything. I was unable to start the service again, every time I tried the process exits and shuts down.</p>
  <p>So I tried to downgrade and at first it ran with the config I used a longtime, but then quit with the same error: can't clone pool group.</p>
  <p>I am at a loss. I don't find anything when I google and the DHCP server just won't run. When I change the config and remove the pool commands, it runs, but that quite seriously misses the point.</p>
  <p>So pretty please, have a look at my config and tell me if you see anything out of order. Or maybe even anything you would do in another way.</p>
  <pre><code>authoritative;
  subnet 192.168.1.0 netmask 255.255.255.0 {
          option routers 192.168.1.1;
          option broadcast-address 192.168.1.255;
          option domain-name &quot;home&quot;;
          option domain-name-servers 192.168.1.30, 192.168.1.1;
          max-lease-time 7200;
          pool {
                  range 192.168.1.1 192.168.1.199;
                  deny unknown-clients;
                  max-lease-time 28800;
          }
          pool {
                  range 192.168.1.200 192.168.1.249;
                  allow unknown-clients;
                  max-lease-time 3600;
          }
    host workstation { hardware ethernet AA:AA:AA:AA:AA; fixed-address 192.168.1.60; }
    host .....
    host and some more hosts, all formated the same
  }
  </code></pre>
  <p>here is the config checked and the response I get.</p>
  <p>root@myHomeServer:/etc/dhcp# dhcpd -t -cf /etc/dhcp/dhcpd.conf
  Internet Systems Consortium DHCP Server 4.4.1
  Copyright 2004-2018 Internet Systems Consortium.
  All rights reserved.
  For info, please visit <a href="https://www.isc.org/software/dhcp/" rel="nofollow noreferrer">https://www.isc.org/software/dhcp/</a>
  can't clone pool group.</p>
  <p>If you think you have received this message due to a bug rather
  than a configuration issue please read the section on submitting
  bugs on either our web page at <a href="http://www.isc.org" rel="nofollow noreferrer">www.isc.org</a> or in the README file
  before submitting a bug.  These pages explain the proper
  process and the information we find helpful for debugging.</p>
  <p>exiting.</p>
  <p>If you can help. Please do so, this is driving me crazy.</p>
  <p>Cheers!</p>