Problems after DC Migration

I have recently migrated from domain controllers running server 2008 r2 to server 2012.  All seemed to be going ok until I started decommissioning the old servers.

I've got a couple of issues that I'm guessing are related.

1. On the majority of my windows 7 machines, there is about a 2 minute black screen after logon.

2. When I click on a network folder, and go to the security tab the network user sids are very slow to resolve.

I've updated the dns server entries on the computers, I've checked in adsiedit to see if any remnants of the old dcs existed, checked the dns records and removed old dc information...
RetirementAdminAsked:
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WayneATaylorCommented:
I assume that you made sure that you moved all of the FMSO roles over to the new server?

What is your new topology, i.e. is the DNS server on the new server etc?

Wayne
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WayneATaylorCommented:
Also did you make sure you made at least one of the new servers a Global Catalogue?

Wayne
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RetirementAdminAuthor Commented:
yes all the fmso roles were transferred sucessfully and currently show the PDC.  dns servers are located on both new dcs
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RetirementAdminAuthor Commented:
yes new dc is global catalog server
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WayneATaylorCommented:
Try a REPADMIN -SHOWREPS and see what servers it thinks are there and if they are upto date etc

Wayne
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WayneATaylorCommented:
Also DCDIAG will often help with these type of problems.

http://technet.microsoft.com/en-us/library/cc731968.aspx

Wayne
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Mike KlineCommented:
Are there any errors or issues on the event logs of the workstations (any group policy issues for example)

Have you verified the health of the new DCs (DCDIAG and the previously mentioned repadmin can help there)

Thanks

Mike
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RetirementAdminAuthor Commented:
only the two new dcs are showing and repadmin /replsum shown the largest delta to be 4 minutes
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SandeshdubeySenior Server EngineerCommented:
It seems to be dns misconfig issue.Ensure that dns is set correctly on DC and clients as below.

Best practices for DNS client settings on DC and domain members.
http://abhijitw.wordpress.com/2012/03/03/best-practices-for-dns-client-settings-on-domain-controller/

Verify the helath of existing DC by dcdiag /q and repadmin /replsum and post the log,Check the client computer system/application event log for any errors and warning and post the same.
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RetirementAdminAuthor Commented:
Thanks for your help.

dcdiag showed error of duplicate name on network.  not sure if this was the domain controller or another workstation.  I read the dns best configuration practices and decided to remove the second network card from the PDC.  I removed all dns entries for the removed network card and now users are logging in much faster.

the SIDs not resolving was caused by my file server not having the updated dns server information.  I updated to the new addresses and the SIDs started resolving.
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