Hello Manikanta_VH,
Thank you for posting on the Microsoft Community Forum.
This information usually indicates that the attempted domain name or domain controller cannot be resolved or contacted. This may be due to DNS setup issues, network connectivity issues, or domain controller service status issues.
As I understand, you have set up one forest with single domain with only one Domain Controller, am I right?
1.Before you add the AD DS role and promote it as Domain Controller, you should set the static IP address as the IP address and set this IP address of this machine itself (or 127.0.0.1) as the Preferred DNS.
2.You should set the DC as the DNS server (I mean you install DNS role on this machine). Also, check the GC option during promotion.
3.You can first check if your network connection is normal.
4.Check if the IP address is pointing the DNS server correctly. Run ipconfig /all to check.
5.If DNS resolution is normal, and if the network port is open (usually because the UDP 389 port is not open).
6.After the DC is promote successfully, please check the health of the Domain Controller by running Dcdiag /v on it and check the result.
7.If DC is healthy, you can install Windows server backup role and back up it.
8.After back up it, you can restore it.
Note:
1.If you back up the full server, you restore the full server.
2.If you back up the system state, you restore the system state.
3.Select location for system state recovery: Original location with the option “Perform an authoritative restore of Active Directory files”. By default, we do not select this check box “Perform an authoritative restore of Active Directory files”.
I hope you the information above is helpful.
If you have any questions or concerns, please do not hesitate to let us know.
Best Regards,
Daisy Zhou