Migration from Server 2003 - 2012 - Unable to promote to DC - ACCESS DENIED

We have a single server running as a file server / domain controller. We are having an issue migrating AD DS from Server 2003 to Server 2012.

When we run the Active Directory Services Configuration Wizard, we receive the following error at the prerequisites check:

Verification of prerequisite for Active Directory preparation failed. Unable to perform Exchange Schema conflict check for domain mydomain.local.
 Exception: Access is denied.
 Adprep could not retrieve data from the server server2003.mydomain.local through Windows Management Instrumentation (WMI).

I've verified that both servers Windows Firewall's are disabled, the Network Service has has logon right, and everyone has full permissions to WMI via WMIMGMT.MSC. I've also run commands to rebuild the WMI store and re-register.

We cannot connect to any PC via WMIMGMT.MSC on the LAN, so I'm starting to think its our Sonicwall TZ120. Everything else is working including DFS replication.
qualityipAsked:
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qualityipConnect With a Mentor Author Commented:
I found that the issue was fixed by checking "Enable Distributed Com" for My Computer under component services on the Server 2003 server.
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Cliff GaliherCommented:
A firewall issue will throw an unable to connect or similarly worded warning. "Access Denied" as very explicitly reserved for a successful connection, but the OS denying access because of permissions. Make sure you are logged in as a member of all necessary admin groups (schema admin being notable) and if you've ever set up delegated permissions in AD and removed default permissions, re-add them or add the user account to the delegated groups as well.
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VirastaRUC Tech Consultant Commented:
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qualityipAuthor Commented:
Found the answer by researching myself
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