DC promo operation failed specified network name is no longer available

If you see the error DCPromo operation failed specified network name is no longer available when attempting to promote a Windows Server to a domain controller, it may be because the server is unable to communicate with other domain controllers on the network.

This can be caused by several things, including:

• -The server’s DNS settings are incorrect and it cannot resolve the domain controller’s name.
• -The server is not connected to the network or there is a firewall blocking communication.
• -There is another domain controller on the network with the same name.

To fix this problem, make sure that the server’s DNS settings are correct and that it can communicate with other domain controllers on the network. If there is another domain controller on the network with the same name, you will need to change the name of one of the servers.

How a DCPromo operation fails error occurs?

When you run DCPromo to promote a Windows Server 2008-based member server to a domain controller, you receive the following error message:

“The specified network name is no longer available”

This issue may occur if the Netlogon service is not running. Additionally, this issue may occur if there are communication problems between the computer on which you are running DCPromo and the existing domain controllers in the forest.

To resolve this issue, first verify that the Netlogon service is running. To do this, follow these steps:

1. Click Start, type services.msc in the Start Search box, and then press Enter.
2. In the list of services, right-click Netlogon, and then click Properties.
3. Verify that the status of the service is Started, and that the Startup type is Automatic. If the service is not running, click Start. If you have to change either the status or the startup type, click OK.
4. Exit Services.

If this does not resolve the issue, follow these steps to verify that there are no communication problems between the computer on which you are running DCPromo and any existing domain controllers in the forest:

1. Click Start, type cmd in the Start Search box, and then press Enter to open a command prompt.
2. At the command prompt, type the following command, and then press Enter:
3. nltest /dclist:<Domain_Name>
4. Replace <Domain_Name> with the fully qualified DNS name of your domain. For example, type nltest /dclist:contoso.com.
5. Verify that at least one domain controller is listed in the output from the previous command. If no domain controllers are listed, this indicates a problem communicating with other domain controllers on your network. In this case, you should check your network settings to make sure that the computer can communicate with other computers on your network.”

If you still cannot resolve the DCPromo operation failed specified network name is no longer available issue, please contact Microsoft Support or raise a ticket. One of the member will join it and resolve your issue with in few hours!!