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4.You’ve installed a PAM-aware restricted service and installed the appropriate /etc/pam.d/<service> file, but you can’t authenticate. What is the best place to look for problems?

Reinstall libpam and reboot; the library isn’t being seen.
Remove /etc/pam.d/<service>, change the /etc/pam.d/other modules entries from pam_deny.o to pam_accept.0 and try again.
Change all controls to optional and try again.
Look for clues in the log file where auth and authpriv messages are logged.

Explanation: When troubleshooting a problem, the first step is always to look at the log files. The log files often indicate the source of a problem.

Incorrect Answers
A: The question is asking where to look for problems. You should look in the log files.
B: The question is asking where to look for problems. You should look in the log files.
C: The question is asking where to look for problems. You should look in the log files.
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