Article ID: 2782375 - View products that this article applies to.
DHCP server will not assign any IP address to the client machines and the following error is logged event viewer.
Log Name: Microsoft-Windows-Dhcp-Server/FilterNotifications
Event ID: 20097
User: NETWORK SERVICE
DHCP Services were denied to machine with hardware address <MAC address>, hardware type 1 and FQDN/Hostname <Machine Name> because it did not match any entry in the Allow List.
This will happen if you have enabled Filters on DHCP server and no MAC address are added to it.
Either add the MAC addresses of the client machines to the filters under DHCP or disable the Filter.
You can disable the Filter through DHCP Console.
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.