To fix the issue:
Edit /etc/maas/rackd.conf and change maas_url:
maas_url=http://{ip_rack_and_machines_can_reach}/MAAS
Restart the maas-rackd service:
sudo systemctl restart maas-rackd
That will ensure that the machines that boot from that rack controller talk to the IP address on the subnet that machines can reach for the region controller.
To fix the issue:
Edit /etc/maas/ rackd.conf and change maas_url:
maas_url=http://{ip_rack_ and_machines_ can_reach} /MAAS
Restart the maas-rackd service:
sudo systemctl restart maas-rackd
That will ensure that the machines that boot from that rack controller talk to the IP address on the subnet that machines can reach for the region controller.