Re: Decommision old domain controller

Giganews Newsgroups
Subject: Re: Decommision old domain controller
Posted by:  Meinolf Weber [MVP-DS] (meiw…
Date: Mon, 11 May 2009

Hello BigSam,

For CA:

Also have a look here:

As you said all 5 FSMO roles has to be transferred to a new DC:

Also a new DC should be DNS server and Global catalog server.

For a how to see here, you didn't mention any OS version so i post an upgrade
from 2000 to 2003 wiht a new installed server:


One question first:
Is the old server also Exchange server and will it be taken out of the domain
forever, when the new server is running?

- On the old server open DNS management console and check that you are running
Active directory integrated zone (easier for replication, if you have more
then one DNS server)

- run replmon from the run line or repadmin /showrepl (only if more then
one DC exist), dcdiag and netdiag from the command prompt on the old machine
to check for errors, if you have some post the complete output from the command
here or solve them first. For this tools you have to install the support\tools\suptools.msi
from the 2000 or 2003 installation disk.

- run adprep /forestprep and adprep /domainprep from the 2003 installation
disk against the 2000 server, with an account that is member of the Schema
admins, to upgrade the schema to the new version

- Install the new machine as a member server in your existing domain

- configure a fixed ip and set the preferred DNS server to the old DNS server

- run dcpromo and follow the wizard to add the 2003 server to an existing

- if you are prompted for DNS configuration choose Yes (also possible that
no DNS preparation occur), then install DNS after the reboot

- for DNS give the server time for replication, at least 15 minutes. Because
you use Active directory integrated zones it will automatically replicate
the zones to the new server. Open DNS management console to check that they

- if the new machine is domain controller and DNS server run again replmon,
dcdiag and netdiag on both domain controllers

- if you have no errors, make the new server Global catalog server, open
Active directory Sites and Services and then double-click sitename, double-click
Servers, click your domain controller, right-click NTDS Settings, and then
click Properties, on the General tab, click to select the Global catalog
check box

- Transfer, NOT seize the 5 FSMO roles to the new Domain controller

- you can see in the event viewer (Directory service) that the roles are
transferred, also give it some time

- reconfigure the DNS configuration on your NIC of the 2003 server, preferred
DNS itself, secondary the old one

- if you use DHCP do not forget to reconfigure the scope settings to point
to the new installed DNS server

- export and import of DHCP database (if needed)

- backup WINS

- restore WINS

Demoting the old DC (if needed)

- reconfigure your clients/servers that they not longer point to the old
DC/DNS server on the NIC

- to be sure that everything runs fine, disconnect the old DC from the network
and check with clients and servers the connectivity, logon and also with
one client a restart to see that everything is ok

- then run dcpromo to demote the old DC, if it works fine the machine will
move from the DC's OU to the computers container, where you can delete it
by hand. Can be that you got an error during demoting at the beginning, then
uncheck the Global catalog on that DC and try again

- check the DNS management console, that all entries from the machine are
disappeared or delete them by hand if the machine is off the network for ever

- also you have to start AD sites and services and delete the old servername
under the site, this will not be done during demotion

Best regards

Meinolf Weber
Disclaimer: This posting is provided "AS IS" with no warranties, and confers
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** HELP us help YOU!!!

> I need to decommision an old server with the roles of PDC &
> Certificate
> Authority.
> I think I know how to add another domain controller to the LAN.
> What steps do I take to make the new DC the PDC?
> I think I open the Operations Masters tool & use it to move the RID,
> PDC &
> Infrastructure from the PDC to the new server. Is there any special
> order I
> need to do these tasks in?
> Are there other steps I need to take?
> What steps do I take to move the CA role to this server?
> I think I install the CA service on the new server & then Retarget
> the
> Certification Authority. Do I need to install a certificate from the
> existing
> CA? What other steps & in what secuence do I do them in?
> Thanks in advance.


In response to

Decommision old domain controller posted by BigSam on Mon, 11 May 2009