:2. [[RenewIP|renew Client IP Address]] or reboot '''all''' your client devices. You can do this by turning off the network and turn it back on after a few seconds on your clients (or unplugging it or turning off WiFi for a few seconds, then), so they get a DHCP lease from your HDA, which includes DNS.
:43. sometimes the clients machine also cache DNS in browsers. To avoid this, you can hard-refresh the browser, or simply reboot the machine.
If you have any fixed IP devices in your network from your router settings, these may not pick up a DHCP lease. You may set them up in your HDA under [http://hda/tab/network/hosts Setup > Networking > Fixed IPs].