This LPIC-2 practice question tests your understanding of network client management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An organization uses LDAP for centralized authentication. The /etc/nsswitch.conf contains 'passwd: files ldap' and 'shadow: files ldap'. The /etc/pam.d/system-auth includes 'auth requisite pam_ldap.so' and 'account required pam_ldap.so'. However, users can log in using local accounts but not LDAP accounts. The ldapsearch command works correctly against the LDAP server. Logs show 'pam_ldap: error trying to bind as user (No such object)'. Which configuration change is most likely needed?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Open TCP port 389 on the client firewall.
Why wrong: Already working per ldapsearch.
Add 'uri ldaps://ldap.example.com' to /etc/ldap.conf.
Why wrong: LDAPS is not required; bind issue is unrelated to encryption.
Restart the nscd service.
Why wrong: Not related to bind failure.
Ensure /etc/ldap.conf contains a valid 'binddn' and 'bindpw' for the search user.
pam_ldap needs a bind DN to search for users.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Ensure /etc/ldap.conf contains a valid 'binddn' and 'bindpw' for the search user.
The error 'pam_ldap: error trying to bind as user (No such object)' indicates that PAM LDAP cannot find the user entry in the LDAP directory. This typically occurs because the binddn (the search user) specified in /etc/ldap.conf is incorrect or missing, preventing PAM from performing the initial search to locate the user's DN. Since ldapsearch works manually, the LDAP server is reachable, but the PAM module lacks the credentials to bind and search for users.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Open TCP port 389 on the client firewall.
Why it's wrong here
Already working per ldapsearch.
Add 'uri ldaps://ldap.example.com' to /etc/ldap.conf.
Why it's wrong here
LDAPS is not required; bind issue is unrelated to encryption.
Restart the nscd service.
Why it's wrong here
Not related to bind failure.
Ensure /etc/ldap.conf contains a valid 'binddn' and 'bindpw' for the search user.
Why this is correct
pam_ldap needs a bind DN to search for users.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates confuse a working ldapsearch (which may use anonymous bind or a different credential) with the PAM module's need for a dedicated binddn and bindpw, leading them to focus on network or caching issues instead of the missing authentication credentials for the search user.
Detailed technical explanation
PAM LDAP uses a two-step bind process: first, it binds with the configured binddn and bindpw to search for the user's DN; second, it attempts to authenticate as that user. If the binddn is invalid or missing, the search fails with 'No such object' because the LDAP server cannot locate the binddn entry. In real-world deployments, the binddn is often a service account like 'cn=admin,dc=example,dc=com', and its password must be stored in /etc/ldap.conf (or /etc/pam_ldap.conf) for the PAM module to function.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the LPIC-2 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Network Client Management — This question tests Network Client Management — Read the scenario before looking for a memorised answer..
The correct answer is: Ensure /etc/ldap.conf contains a valid 'binddn' and 'bindpw' for the search user. — The error 'pam_ldap: error trying to bind as user (No such object)' indicates that PAM LDAP cannot find the user entry in the LDAP directory. This typically occurs because the binddn (the search user) specified in /etc/ldap.conf is incorrect or missing, preventing PAM from performing the initial search to locate the user's DN. Since ldapsearch works manually, the LDAP server is reachable, but the PAM module lacks the credentials to bind and search for users.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This LPIC-2 practice question is part of Courseiva's free LPI certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LPIC-2 exam.
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