Enabling the DHCP service in a RO Active Directory DC in W2K8 R2

Posted: April 21, 2010 in Uncategorized


You get the following error when trying to start the DHCP service in a Read-Only Domain Controller within Windows 2008 2008/R2 server:

The DHCP Server service terminated with the following error:

The request is not supported.


The DHCP service was unable to create or lookup the DHCP Users local group on this computer.  The error code is in the data.


Since the Read-Only DC can’t write back to Active Directory in order to create the DHCP Administrators/Users security groups the service local DHCP service in the RO DC fails to start.

In order to remedy this you need to install the DHCP role within a regular R/W DC and replicate the data to the R/O DC. Once that happens you’re able to start the service. This only applies to DCs that will be hosting the first DHCP server in a Forest and happens to be an RODC.

In my case I have a total of 4 DCs in different sites but only my datacenters have R/W DCs, my regular offices have R/O DCs. Since there is no need for my servers at the datacenter to grab IPs from a DHCP server I installed the role (in order to create the security groups) in a R/W DC and then I stopped and disabled the service within that DC.

  1. I seldom drop responses, however after reading through a few of the comments here Enabling the DHCP service in a RO Active Directory DC in W2K8 R2
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