Adding or Removing Domain Computers

Before an Advanced Server or a Windows NT computer can become a domain member and participate in domain security, it must be added to the domain. Computers that are added to a domain are given accounts in the domain’s security database. If the added computer is a server, after it is added, it also receives a copy of the domain’s security database.

There are five ways to add a computer to a domain. Only one of these methods requires Server Manager.

An administrator of an Advanced Server computer can use the Network Configuration Manager to change a computer’s domain without reloading the server software. To do so:

Ensure that the primary domain controller is running in the domain that is being joined.

In the Network Configuration Manager, select SCO Advanced Server, then select Modify protocol configuration from the Protocol menu.
You will be notified that the server will be stopped and that local databases will be reinitialized; this is normal behavior when the domain is changed.

Enter the new Primary domain controller and domain names, as well as the administrative password.

After confirming your selection and exiting the Network Configuration Manager, restart the server with the net start server command.

A Windows NT Workstation computer can be added to a domain during installation of Windows NT and an Advanced Server or a Windows NT Server computer can be added to a domain during installation, but only if the installations are performed by an administrator.

An administrator can add an existing Windows NT Workstation computer to a domain using the Network option of that workstation’s Control Panel. However, a Windows NT backup domain controller cannot be added to the domain in this way.

An administrator or an account operator can use Server Manager’s Add To Domain command to add a computer account to the domain’s security database. Then, the computer user must join the domain under that computer account.

On a Windows NT Server computer, this must be done at installation. On a Windows NT Workstation computer, it can be done either during or after installation using the Network option of the Windows NT Workstation computer’s Control Panel. It is not necessary to use the Server Manager to add computer accounts for Advanced Server computers; accounts are added automatically at installation or when the Advanced Server’s domain is changed.

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NOTE: When Server Manager is used to add a computer to a domain, that computer name must be treated as a security element. Until the intended computer joins the domain, it is possible for a user to give a different computer name and then have it join the domain using the computer account you have just created. If the added computer is a backup domain controller, when it joins, it receives a copy of the domain’s security database.
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To add a Windows NT computer to a domain, you must be logged on to a user account that is a member of the Administrators, END Admins, or Account Operators group of that domain.

⇔ To use Server Manager to add a Windows NT computer to a domain

From the Computer menu, choose Add To Domain.

Under Computer Type, choose Windows NT Workstation or Server or Windows NT Backup Domain Controller.

Enter the computer name in the Computer Name box.
You can type the name using both uppercase and lowercase letters; the computer name always will display in uppercase letters, and Windows NT will store the name in uppercase letters.

Choose the Add button.
In the domain’s security database, an account is added for that computer name.

Choose the Close button.
The computer is added to Server Manager’s list. However, until the computer joins the domain (as described in step 6), the computer’s icon is dimmed and its version number and description are absent from the list.

After a computer has been added, instruct the user of that computer to join the domain. For Windows NT Workstation computers, this can be done either while installing Windows NT on the computer, or if Windows NT is already installed on the computer, using the Network option of that computer’s Control Panel. For Windows NT Server computers, this must be done at installation.
⇔ To remove a workstation or a server from a domain

Select a computer from the list in the Server Manager window.
Do not select the primary domain controller. It cannot be removed.

From the Computer menu, choose Remove From Domain.
The computer’s account is deleted from the domain’s security database. It can no longer participate in domain security.

If the computer being removed from the domain is a Windows NT Workstation, then instruct the user of that computer to remove it from the domain using the Network option in the Control Panel, and to enter (as appropriate) another domain name or workgroup name.
A Windows NT backup domain controller cannot change domains unless Windows NT is reinstalled. Windows NT Workstation computers can change domains without reinstalling Windows NT. Advanced Server computers can change domains using the Network Configuration Manager.
⇔ To change a Windows NT workstation from one domain to another

From the Computer menu, choose Select Domain and complete the information fields in the Select Domain dialog box, specifying the new domain.

From the Computer menu, choose Add To Domain and complete the information fields in the Add Computer To Domain dialog box.

Instruct the user of that workstation to enter the new domain name in the Network option in the Control Panel.

From the Computer menu, choose Select Domain and complete the information fields in the Select Domain dialog box, specifying the old domain.

Select the computer name from the list in the Server Manager window, and then from the Computer menu choose Remove From Domain.
⇔ To change the computer name of a Windows NT computer

From the Computer menu, choose Add To Domain and complete the information fields in the Add Computer To Domain dialog box, specifying the new computer name.

Instruct the user of that computer to change the computer name in the Network option in the Control Panel.

Select the old computer name from the list in the Server Manager window, and then from the Computer menu, choose Remove From Domain.

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