An Active Directory domain is a collection of objects within a Microsoft Active Directory network. A domain join is a feature introduced in Windows 7 that allows a user to securely connect remotely to his work domain using his credentials. When faced with this type of issue, you will need to investigate your DNS Server and IP parameters for the client carefully. For how to set up a domain, see the following link. Also for how to add a second DC, see the following link. For how to join a PC to a Domain, see the following link.
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How to fix Domain Joining Errors
The following error is prompted when the server isn’t pointing to the right DNS server in your enterprise or Lab environment.
To fix this issue, please follow the recommendations below.
Ensure to set on the client machine, the right DNS Server address. This should point to the IP address of the DNS Server.
Ensure your DNS record has the right IP parameters. See “How to fix nslookup unknown: cannot find non-existent domain” for more information.
Then you should be able to have the PC joined to the domain afterwards.
I hope you found this blog post on how to fix Domain Joining Errors helpful. Please let me know in the comment session if you have any questions.