DHCP server will not lease IP addresses to clients

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
Source:        Microsoft-Windows-DHCP-Server
Event ID:      20097
Level:         Information
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.

  1. Open DHCP Console.
  2. Expand domainname.local (Domain name will be your local domain name).
  3. Expand IPv4.
  4. Expand Filters.
  5. Right click on Allow and choose Disable

More information
By default these filters are disabled on DHCP server.
DHCP Offer Filter 20097
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

Article ID: 2782375 - Last Review: 11/21/2012 09:02:00 - Revision: 1.0

Windows Small Business Server 2011 Essentials, Windows Small Business Server 2011 Premium Add-On, Windows Small Business Server 2011 Standard

  • KB2782375