Joining a server to an existing domain controlled by a Domain Controller involves a process called "Domain Join." Here are the steps to make a server a member of another server's domain controller:

Prerequisites:

• You must have administrative credentials for both the server you want to join to the domain and the domain controller.

• Ensure network connectivity and DNS resolution between the server and the domain controller.

Steps:

1. Log In to the Server: Log in to the server that you want to join to the domain using an account that has local administrative privileges on the server.

2. Open System Properties:

   • On Server Manager, go to "Local Server" and click on "WORKGROUP".

     

3. Click on "Change":

   • Under the "Computer Name" tab, click the "Change" button.

     

4. Join a Domain:

   • In the Computer Name/Domain Changes window, select the "Domain" option.

   • Enter the name of the domain you want to join.

     

5. Provide Domain Credentials:

   • You'll be prompted to provide domain credentials with the necessary privileges to join the domain. Typically, you'll need an account with Domain Administrator privileges.

   • Enter the username and password, and click "OK."

     

6. Complete the Join Process:

   • If the credentials are valid and you have the necessary permissions, the server will join the domain.

     

   • You may be prompted to restart the server to apply the changes. If prompted, go ahead and restart the server.

     

7. Verify Domain Membership:

   • After the server reboots, you can verify that it has successfully joined the domain by logging in using a domain user account.

     

8. Administrative Access: You can now manage the server's permissions and settings through the domain controller's Active Directory Users and Computers tool. Additionally, you can assign domain user accounts the necessary permissions on the server.

By following these steps, you can successfully make your server a member of another server's domain controller, allowing it to participate in the domain's centralized authentication and authorization system.