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Raising Forest Functional Level

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Last Modified: 2017-03-10
Hi,
I'm getting the following error when trying to raise forest functionality on a Server 2008 R2 server.

you cannot raise the forest functional level.
either this forest includes domain controllers that are not running the appropriate version of Windows,
or one or more domains in the forest are still at Window 2000 mixed functional level or Windows Server 2003 interim

Current Forest Level
Windows Server 2003

We also run a Server 2003 domain controller alongside the 2008.  I've followed steps online as per the link below:
https://technet.microsoft.com/en-us/library/cc730985(v=ws.11).aspx

Can anyone provide any advice on how to get around this?

Thanks
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Systech AdminChief Technology Officer
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Commented:
Please check with dcdiag command about the status of all domain controllers  and share the results

Author

Commented:
I've attached the results of the dcdiag from the 2 DC's - i hope this is what you've asked for.
dcdiag.txt
Systech AdminChief Technology Officer
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Commented:
thanks for sharing the info. Report shows issues with DC replication among other DCs, you will need to first fix the DC issues.

Author

Commented:
Sill question - but from the logs are you able to point me in the right direction as far as how to fix the replication?

I ran repadmin /replicate dest-server source-server DC=,DC=. and its run successfully
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Distinguished Expert 2018

Commented:
Nothing to resolve. You cannot raise the forest functional level higher than the LOWEST domain controller. So that 2003 DC means your forest functional level at 2003 is already as high as it can go.

Author

Commented:
So i need to demote the 2003 server before i can raise the functional level higher?  

Is that what your saying.
Shaun VermaakSenior Consultant
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Awarded 2017
Distinguished Expert 2019

Commented:
Resolve it by upgrading all your domain controllers to the DFF/FFL that you want to raise to. I recommend at least 2008 R2
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Commented:
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Author

Commented:
Thank you - decommissioning the server worked.
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