If you want to rename your domain controller after server migration you can do this using netdom.exe utility.You need to make sure you have an additional domain controller before proceeding with this procedure.
Note:- Domain Controllers running Microsoft's Certificate Authority services (CA) can never be renamed.
First you need to make sure you have Windows Server 2003 Support Tools install in your server you can download from here
After installing support tools follow this procedure
Open Command Prompt fro Start>Run>cmd type the following command
netdom computername CurrentComputerName/add:NewComputerName
This command will update the service principal name (SPN) attributes in Active Directory for this computer account and register DNS resource records for the new computer name. The SPN value of the computer account must be replicated to all domain controllers for the domain and the DNS resource records for the new computer name must be distributed to all the authoritative DNS servers for the domain name. If the updates and registrations have not occurred prior to removing the old computer name, then some clients may be unable to locate this computer using the new or old name.
Ensure the computer account updates and DNS registrations are completed and now type
netdom computername CurrentComputerName/makeprimary:NewComputerName
Restart your windows server 2003
pen Command Prompt fro Start>Run>cmd type the following command
netdom computername NewComputerName/remove:OldComputerName
Options in Detail
CurrentComputerName :- The current, or primary, computer name or IP address of the computer you are renaming.
NewComputerName :- The new name for the computer. The NewComputerName must be a fully qualified domain name (FQDN).
OldComputerName :- The old name of renamed computer.
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