Lesson 3 in .NET framework

Create QR Code in .NET framework Lesson 3

Lesson 3
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Troubleshooting Computer Accounts
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Figure 5-6 Logon message from a Windows XP client indicating a possible computer account problem
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Error messages or events in the event log indicating similar problems or suggest ing that passwords, trusts, secure channels, or relationships with the domain or a domain controller have failed. 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 ear lier 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 try and choose a workgroup name that you know is not in use. 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 com puter account. 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 sys tem 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
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Computer Accounts
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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. With these four rules, you can make an informed decision, on the job or on the certi fication exams, about how to address any scenario in which a computer account has lost functionality.
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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 admin istrator 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.
Exercise 1: Troubleshooting Computer Accounts
1. Identify the most likely cause of the user s problem: a. The user entered an invalid user name. b. The user entered an invalid password. c. The user chose the incorrect domain from the Log On To list. d. The computer has lost its secure channel with the domain. e. The computer s registry is corrupted. f. The computer has a policy preventing the user from logging on interactively.
The correct answer, as you can probably deduce, is d. The computer has lost its secure channel with the domain.
2. Identify the steps from the list below that you must take to troubleshoot the prob lem. Put the steps in order. You may not require all steps. a. Enable the computer account. b. Change Desktop03 to belong to contoso.com. c. Determine whether the computer account exists in Active Directory. d. Reset or re-create the computer account.
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