Computer Accounts in C#.NET

Printer Code 39 in C#.NET Computer Accounts

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Computer Accounts
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the computer with a significantly outdated password, the computer will not be able to authenticate. 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:
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Messages at logon indicate that a domain controller cannot be contacted, that the computer account might be missing, that the password on the computer account is incorrect, or that the trust (another way of saying the secure relationship ) between the computer and the domain has been lost. An example is shown in Figure 5-6.
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Figure 5-6 problem
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Logon message from a Windows XP client indicating a possible computer account
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Error messages or events in the event log indicating similar problems or suggesting that passwords, trusts, secure channels, or relationships with the domain or a domain controller have failed. One such error is NETLOGON Event ID 3210: Failed To Authenticate, which appears in the computer s event log. A computer account is missing in Active Directory.
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If one of these situations occurs, you must troubleshoot the account. You learned earlier how to delete, disable, and reset a computer account and, at the beginning of the chapter, how to join a machine to the domain. The rules that govern troubleshooting a computer account are: A. If the computer account exists in Active Directory, it must be reset. B. If the computer account is missing in Active Directory, you must create a computer account. C. If the computer still belongs to the domain, it must be removed from the domain by changing its membership to a workgroup. The name of the workgroup is irrelevant. Best practice is to choose a workgroup name that you know is not in use. In scenarios involving computer failure or the deployment of a new system to a user, you accomplish this step by installing or reinstalling the operating system using the same computer name as the previous system. D. Rejoin the computer to the domain. Alternatively, join another computer to the domain; but the new computer must have the same name as the computer account.
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Lesson 2
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Managing Computer Accounts
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To troubleshoot any computer account problem, apply all four rules. These rules can be addressed in any order, except that Rule D, involving rejoining the computer to the domain, must, as always, be performed as the final step. Let s examine two scenarios. In the first scenario, a user complains that when he or she attempts to log on, the system presents error messages indicating that the computer account might be missing. Applying Rule A, you open Active Directory Users And Computers and find that the computer account exists. You reset the account. Rule B does not apply the account does exist. Then, using Rule C, you disjoin the system from the domain and, following Rule D, rejoin the domain. In a second scenario, if a computer account is reset by accident, the first item that has occurred is Rule A. Although the reset is accidental, you must continue to recover by applying the remaining three rules. Rule B does not apply because the account exists in the domain. Rule C indicates that if the computer is still joined to the domain, it must be removed from the domain. Then, by Rule D, it can rejoin the domain.
Exam Tip
With these four rules, you can make an informed decision, on the job or on the certification exams, about how to address any scenario in which a computer account has lost functionality.
One other easily solved scenario arises when the computer s account has been disabled. Simply right-click the computer object in Active Directory Users And Computers and choose Enable.
Practice: Troubleshooting Computer Accounts
In this practice, you will troubleshoot a realistic scenario. A user in the contoso.com domain contacts you and complains that, when logging on to Desktop03, he or she receives the following error message: Windows cannot connect to the domain, either because the domain controller is down or otherwise unavailable, or because your computer account was not found. Please try again later. If this message continues to appear, contact your system administrator for assistance. The user waited, attempted to log on, received the same message, waited again, and then received the same message a third time. The user has now spent 20 minutes trying to log on. In obvious frustration, the user contacts you for assistance.
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