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5-3+ Practice: Troubleshooting Computer Accounts

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.
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 problem. 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.
Lesson 3 Troubleshooting Computer Accounts 5-23 e. Change Desktop03 to a workgroup.
f. Delete the computer account.
g. Disable the computer account.
The correct answer is steps e, c, d, and b. Step e does not have to occur first; it just has to be done anytime before step b. Steps c and d must occur, in that order, before step b, which must be the last step.
Exercise 2: Recover from Computer Account Problems
1. Open Active Directory Users And Computers.
2. Click Find Objects In Active Directory and search for Desktop03.
3. Desktop03 appears in the search results because you created it in Lesson 1.
4. Having identified that the account does exist, reset the account by right-clicking Desktop03 and choosing Reset Account.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the “Questions and Answers” section at the end of this chapter.
1. After a period of expansion, your company created a second domain. Last week-end, a number of machines that had been in your domain were moved to the new domain. When you open Active Directory Users And Computers, the objects for those machines are still in your domain, and are displayed with a red “X” icon. What is the most appropriate course of action?
a. Enable the accounts
b. Disable the accounts
c. Reset the accounts
d. Delete the accounts
2. A user reports that during a logon attempt, a message indicated that the computer cannot contact the domain because the domain controller is down or the computer account may be missing. You open Active Directory Users And Computers and discover that the account for that computer is missing. What steps should you take?
5-24 Chapter 5 Computer Accounts 3. A user reports that during a logon attempt, a message indicates that the computer cannot contact the domain because the domain controller is down or the computer account may be missing. You open Active Directory Users and Computers and that computer’s account appears normal. What steps should you take?
Lesson Summary
■ Computers maintain accounts that, like users, include a SID and group member-ships. Be careful about deleting computer objects. Disabling computer objects allows you to enable the objects again, when the computer needs to participate in the domain.
■ Problems with computer accounts are generally quite evident, with error messages and events logged that indicate problems in an account, a password, a secure channel or a trust relationship.
■ Using the four rules in Lesson 3, you can troubleshoot just about any computer account problem.

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