Raising the functional level on a large forest/domain with a DC offline?

Hello All
I've done what research that I can and haven't been able to find a definitive answer outside of people purposely taking a DC offline while raising the functional level of a forest in case they need to do an authorative restore, but I have a bit of a different
situation and I just need to confirm something.
I have to perform the task on a very large AD infrastructure that includes 90+ domain controllers globally and I've run into a scheduling conflict that is out of my control. One of the locations overseas will be going through some maintenance during
my time window when I will be raising the functional level of the forest and domain.
The question is, what happens to the DC that is offline during this period? Once it is restarted, do the changes replicate to that DC, or do I need to perform the task in place for that DC? If anyone has any links or instructions on how to bring a DC online
after the functional level of both the forest and domain have been raised, please let me know.

The DC can be offline and it won't be an issue. when it comes back online the changes should replicate to it. Just don't keep it offline longer than the tombstonelifetime.
Paul Bergson
MVP - Directory Services
MCITP: Enterprise Administrator
MCTS, MCT, MCSE, MCSA, Security, BS CSci
2012, 2008, Vista, 2003, 2000 (Early Achiever), NT4
Twitter @pbbergs http://blogs.dirteam.com/blogs/paulbergson
Please no e-mails, any questions should be posted in the NewsGroup.
This posting is provided AS IS with no warranties, and confers no rights.

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We have 75 domain Controllers in our Org and current Domain Functional level is 2003. We have a mix setup where all versions of OS are available starting from 2003. A large no of applications are also integrated with our current Active Directory.
My concern is, If I raise my Domain Functional level to 2008 then what are the consequences we might face in terms of accessing legacy applications.
Please let me know the checklist which we need to follow and incase of any failure then what will be the rollback procedure.
Looking forward for your valuable inputs.

Hi,
I agree with others. Once the Functional Level has been upgraded, new
servers running on lower versions cannot be added
as Domain Controllers to the domain or forest. If all the DCs in the domain is server 2008 and later version, we can raise the function level of the domain to get more advanced features.
> If I raise my Domain Functional level to 2008 then what are the consequences we might face in terms of accessing legacy applications.
For this question, make sure that the applications in the domain are compatible with the new functional level
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Raising the Functional Levels
http://technet.microsoft.com/en-us/library/cc771949(v=WS.10).aspx
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many thanks!
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hi,
Thanks for posting.
Sorry i don't know if i am understanding your question. Are you talking about upgrading your DC's in your current forest to 2012 then raising the functional level?
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if i've got what you were asking wrong, please let me know, otherwise hopefully this helps.
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Help keep the forums tidy, if this has helped please mark it as an answer
Blog: http://www.windows-support.co.uk
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Raising Functional level - From 2003 to 2008R2

Recently I have completed the AD upgrade from 2003 to 2012. Now all sites have 2012 DCs only. Next i plans to raise the functional level of both Forest and Domain from 2003 t0 2008R2.
I want to know the things to take care before doing this upgrade.

hi,
if you are only using 2012 DC's that you may want to go straight to 2012 functional level. The functional level change is generally classed as low impact and simply tells AD it can use all it's additional features.
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AD before doing the change to ensure that it won't affect the running of this software.
There is a very good article here from the MS Directory team on the process and the impact.
http://blogs.technet.com/b/askds/archive/2011/06/14/what-is-the-impact-of-upgrading-the-domain-or-forest-functional-level.aspx
Regards,
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Help keep the forums tidy, if this has helped please mark it as an answer
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Raise domain functional level

Hi All,
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Have you restarted the DCs after that you raised the functional level? The password of the krbtgt account is reset when the DFL is raised from 2003 -> and sometimes the DCs need to be restarted for the authentication to succeed up to the root.
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Hi i have that error in my Domain Controller. Install Windows
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This Domain Controller no longer exists,
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To update the domain functional level, the Active Directory Domain Controllers in the domain must be running the appropriate version of windows.
domain Name
xxxxxx.local
Current domain functional level
Windows Server 2008
The following Active Directory Domain Controllers are running earlier versions of windows:
domain Name AD DC Version of Windows
xxxxxxx.local server.xxxxxx.local Windows Server® 2008 Standard 6.0 (6001)
that I can
do?

it might be in the "LostAndFoundConfig" container in the Configuration partition.
Something like this should be logged:
Event Type: Warning
Event Source: NTDS General
Event Category: Directory Access
Event ID: 1723
Date: 6/4/2005
Time: 7:39:52 AM
User: NTDEV\A1ADCH
Computer: NTDEV-DC-07
Description:
Active Directory failed to raise the functional level of the domain or forest
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Object (forest or domain):
DC=ntdev,dc=corp,DC=microsoft,DC=com
NTDS Settings object of domain controller:
CN=NTDS Settings,CN=LostAndFoundConfig,CN=Configuration,DC=ntdev,DC=corp,DC=com
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http://go.microsoft.com/fwlink/events.asp.
Delete the 'NTDSA' object from the "LostAndFoundConfig" container using ADSIEdit.
Enfo Zipper
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Hi!
My Enterprise wants to know if this supported Lync Server (UM 14.01, Front End
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You must raise all domains in which you deploy Lync Server 2010 to a domain functional level of Windows Server 2008 R2, Windows Server 2008, or at least Windows Server 2003 native mode. Windows Server 2003 mixed mode is not supported.
All forests in which you deploy Lync Server 2010 must be raised to a forest functional level of Windows Server 2008 R2, Windows Server 2008, or at least Windows Server 2003 native mode. Windows Server 2003 mixed mode is not supported.
Lync 2013 Support domain and forest Function level 2012R2 but Lync 2020 support domain and forest function level 2008R2.
For more info, you can refer below link
http://technet.microsoft.com/en-us/library/gg412831%28v=ocs.14%29.aspx
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I need some guidance in finding a tombstone in a forest that has 90 domain controllers and 79 sites. Each domain controller is receiving three daily EventID 1864 alerts. One for the domain partition, one for the configuration partition and one
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If strict replication consistency on domain controller is not enabled, lingering objects can be replicated to domain controller.
AD DS: Strict replication consistency should be enabled on all domain controllers in this forest
http://technet.microsoft.com/en-us/library/dd723692(v=ws.10).aspx
Strict Replication Consistency - Myth versus Reality
http://blogs.technet.com/b/askds/archive/2010/02/15/strict-replication-consistency-myth-versus-reality.aspx
http://technet.microsoft.com/en-us/library/cc816938(v=ws.10).aspx
If the server has reached tombstone lifecycle period the best way to deal with is demote/promote the DC.You cannot demote the faulty DC gracefully you need to do forcefull removal.You need to ran dcpromo/force removal and then run matadata cleanup on other
DC(healthy) to remove the instance of faulty DC from AD database and DNS.If faulty DC is fsmo role holder server the you need to seize the FSMO role on other DC.Once done you can promote the Server back as DC.
Sometimes its difficult to remove lingering object either using repadmin /removelingeringobjects or other tool. If lingering objects spreads then its more difficult to tackle them, demoting & promoting the server containg the lingering is best bet.
Complete Step by Step Guideline to Remove an Orphaned Domain controller (including seizing FSMOs, running a metadata cleanup, and more)
http://msmvps.com/blogs/acefekay/archive/2010/10/05/complete-step-by-step-to-remove-an-orphaned-domain-controller.aspxis
To remove lingering object see this:http://blogs.technet.com/b/glennl/archive/2007/07/26/clean-that-active-directory-forest-of-lingering-objects.aspx
Hope helps
Best Regards,
Sandesh Dubey.
MCSE|MCSA:Messaging|MCTS|MCITP:Enterprise Adminitrator |
My Blog
Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

Lync 2013 and Raising Forest/Domain Functional Level?

My current forest and domain functional levels are 2008 R2. I know I can safely upgrade the functional levels in most cases, but I want to specifically know with regards to Lync.
Our entire environment, including Lync, is running on Windows Server 2012 R2. (We have no domain joined clients.) We are running Lync 2013 Standard with all the latest updates.
Can I safely raise the forest and domain functional levels to 2012 R2 without impacting Lync?

Hi,
Yes, you can raise Forest and domain function level to Windows Server 2012 R2 without issue.
After raising Forest\domain function level, the new features that rely on the functional level are generally limited to AD itself. Regardless, changing the Domain or Forest Functional Level should have no impact on an application that depends on
Active Directory.
More details:
http://blogs.technet.com/b/askds/archive/2011/06/14/what-is-the-impact-of-upgrading-the-domain-or-forest-functional-level.aspx
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

Which domain and forest functional level is supportted for the "Active Directory Resource Pool Synchronization"?

Hi all,
I'd like to confirm which Domain/Forest functional levels of Active Directory is supported for "Active Directory Resource Pool Synchronization" in Project Server 2013.
I guess that 2003 or later is supported, but my customer required reliable sources.
I googled and searched article at TechNet, but I couldn't find.
Could anyone inform me the article about that?
Thank you in advance.
Kaori.

Hi Michael and all,
Anyway I solved this issue.
I couldn't find article that I desired, so I asked advice to my colleagues and they told that the functional level 2003 or later are supported in their experience.
In addition, I found these articles about SharePoint sync limitations.
Members of the domain local group cannot view a Microsoft Office SharePoint Server 2007 Web site
http://support.microsoft.com/kb/932378/en-us
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http://support.microsoft.com/kb/970612

Raising the functional level on a large forest/domain with a DC offline?

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