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DCPROMO issues from server 2008 R2 , transferring to server 2012 R2

i am trying to dcpromo a DC from 2008 R2 and i keep getting an error stating the operation failed because it cant connect to another DC (2012 R2 machine). i have transferred roles succesfully, ran FSMO successfully, but old DC will not demote. i turn old DC off and active directory in new DC (2012 R2 ) machine stops functioning and all my users disappear. only when i turn on old DC does active directory begin to function correctly. any advice on what to do? DNS and DHCP is working correctly on new DC.

M A

First thing shutdown your old DC for couple of days and check for issues as there is a chance for service outage.
If everything works fine start again remove without replicating.
dcpromo /forceremoval

bhamilton3180

ASKER

i dont have a couple of days. server must be ready to roll out by this monday. i have a 100 users waiting.

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Lee W, MVP

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Lee W, MVP

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Sajid Shaik M

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bhamilton3180

ASKER

Thanks Shaik. This is what I did

http://thetechnosolution.com/migrate-server-2008-r2-to-server-2012-r2/

DNS and DHCP is working on the new DC. I ran into this issue like over a year and a half ago and forgot how I solved it. FSMO roles transferred over just fine. I get correct response when I query them.

DC promo failed from old server.

Lee W, MVP

If you want this resolved you should answer my questions. What did you find when running DCDIAG /C /E /V on the DC that won't Demote? Did you run REPADMIN /SHOWREPL? You should also post screenshots of error messages. You need this done ASAP? Then you need to work with us all!

M A

@bhamilton3180
Appreciate if you respond to experts comments.

M A

I believe this can be closed as there is enough information to resolve this issue