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Demoting a PDC

By Corky132 ·
I'm trying to demote a pdc to a bdc.. I have two servers that are PDC's.. (one's turned off now).. how do i demote the pdc without a bdc present? (server manager DOESNT have an option to demote the PDC).. at least it's not active..

maybe there isa command line tool to do this? any help would be great..

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Demoting a PDC

by ustutz In reply to Demoting a PDC

The only way to "demote" a PDC is to have both PDCs turned on - at least one of them will then display the "Demote" option (ILO the "promote" option) in server manager. By defintion, you always need one Primary Domain Controller - you cannot run with only BDCs. The way you'd get two PDCs at once is: Real PDC goes down. You promote BDC to 'acting' PDC. Real PDC is fixed. Real PDC will then want to come back to be the PDC: As the real PDC was down when it happened, it will have no record ofthe BDC's promotion in its - the primary - security database. Only the acting PDC will have a record of its own promotion - thus knowing that it is due for a demotion again.

To make the acting PDC the permanent PDC, demote it for now. Then, from the 'real' PDC, in server manager, promote the BDC to be the new PDC. That way the transfer of power is recorded in both servers' security database.

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Demoting a PDC

by Corky132 In reply to Demoting a PDC
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Demoting a PDC

by Dennis@l In reply to Demoting a PDC

See Microsoft Article Q167248. To demote the original PDC just brought back online, use Server Manager. Under
the View menu, clear the check box next to "Show domain members only." This
allows a browse list to inform Server Manager that the computer is configured as
a PDC, and will allow it to be demoted. Select the original PDC, and select
"Demote to backup domain controller" under the Computer menu.

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Demoting a PDC

by Corky132 In reply to Demoting a PDC
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Demoting a PDC

by riyaz In reply to Demoting a PDC

It seems you installed the 2nd domain controller without the connection. You need to installed the 2nd one after the router and proper connection. Than only you can demote & promote any domain controller.
I think you need to upload the full operationg system with the connection.

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Demoting a PDC

by Corky132 In reply to Demoting a PDC
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Demoting a PDC

by singhjunk In reply to Demoting a PDC

If your PDC went off-line before promoting a BDC, the registry entry on the PDC which governs the server role was not changed.

When you bring the PDC on-line, it comes up as a PDC. When it finds that another computer is the PDC, it simply stops its' NetLogon service. The only way to fix this is to edit the registry at:

HKEY_LOCAL_MACHINE\Security

Choose Security / Permissions and insure that Administrators have Full Control on this key and all sub-keys. Navigate to:

HKEY_LOCAL_MACHINE\Security\Policy\PolSrvRo and change the <no name> value entry from 03000000 to 02000000

where the 3 indicates Primary and the 2 indicates Backup.

Shutdown and restart Windows NT on the old PDC. It will restart as a BDC which you can then promote.

I hope that helps a little.

Thanks,
Jasjeet Singh

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Demoting a PDC

by Corky132 In reply to Demoting a PDC
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Demoting a PDC

by paskettj In reply to Demoting a PDC

Corky,

Bring them both up, after the second one sees the other PDC they will both demote themselves, allowing you the chance to promote the one of choice. (I hope you choose the one with the most recent changes to the SAM)

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Demoting a PDC

by Corky132 In reply to Demoting a PDC
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