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DSRM ObjectDN
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Lesson 3
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Troubleshooting Computer Accounts
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Where ObjectDN is the distinguished name of the computer, such as CN=Desktop15, OU=Desktops,DC=contoso,DC=com. Again, you will be prompted to confirm the deletion.
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When a computer is disjoined from a domain when an administrator changes the membership of the computer to a workgroup or to another domain the computer attempts to delete its computer account in the domain. If it is not possible to do so because of lack of connectivity, networking problems, or credentials and permissions, the account will remain in Active Directory. It may appear, immediately or eventually, as disabled. If that account is no longer necessary, it must be deleted manually.
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If a computer is taken offline or is not to be used for an extended period of time, you may disable the account. Such an action reflects the security principle, that an identity store allow authentication only of the minimum number of accounts required to achieve the goals of an organization. Disabling the account does not modify the com puter s SID or group membership, so when the computer is brought back online, the account can be enabled. The context menu, or Action menu, of a selected computer object exposes the Disable Account command. A disabled account appears with a red X icon in the Active Direc tory Users And Computers snap-in, as shown in Figure 5-5.
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A disabled computer account
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While an account is disabled, the computer cannot create a secure channel with the domain. The result is that users who have not previously logged on to the computer, and who therefore do not have cached credentials on the computer, will be unable to log on until the secure channel is reestablished by enabling the account. To enable a computer account, simply select the computer and choose the Enable Account command from the Action or shortcut menus.
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5-20
5
Computer Accounts
To disable or enable a computer from the command prompt, use the DSMOD com mand. The DSMOD command modifies Active Directory objects. The syntax used to disable or enable computers is:
DSMOD COMPUTER ComputerDN -DISABLED YES DSMOD COMPUTER ComputerDN -DISABLED NO
If a computer account s group memberships and SID, and the permissions assigned to that SID, are important to the operations of a domain, you do not want to delete that account. So what would you do if a computer was replaced with a new system, with upgraded hardware Such is one scenario in which you would reset a computer account. Resetting a computer account resets its password, but maintains all of the computer object s properties. With a reset password, the account becomes in effect available for use. Any computer can then join the domain using that account, including the upgraded system. In fact, the computer that had previously joined the domain with that account can use the reset account by simply rejoining the domain. This reality will be explored in more detail in the troubleshooting lesson. The Reset Account command is available in the Action and context menus when a computer object is selected. The DSMOD command can also be used to reset a com puter account, with the following syntax:
dsmod computer ComputerDN -reset
The NETDOM command, included with the Windows Server 2003 Support Tools in the CD-ROM s Support\Tools directory, also enables you to reset a computer account.
Recognizing Computer Account Problems
Computer accounts, and the secure relationships between computers and their domain are robust. In the rare circumstance that an account or secure channel breaks down, the symptoms of failure are generally obvious. The most common signs of computer account problems are: Messages at logon indicate that a domain controller cannot be contacted; that the com puter account may be missing; or that the trust (another way of saying the secure rela tionship ) between the computer and the domain has been lost. An example is shown in Figure 5-6.
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