The answer is the CLI command `diagnose debug authd fsso list`. This command is the correct choice because it queries the authentication daemon (authd) to display all FSSO users currently known to the FortiGate, showing each user’s IP address, login state, and the domain controller that authenticated them. When users report that their web traffic is blocked despite being logged into the domain, this command directly verifies whether the FortiGate has actually received and stored the user’s FSSO login information from Active Directory polling. On the Fortinet NSE 4 Network Security Professional exam, this question tests your ability to troubleshoot FSSO authentication failures—a common scenario where a user is domain-authenticated but the firewall still sees them as “unauthenticated” traffic. A frequent trap is confusing this with `diagnose debug authd fsso show`, which only shows configuration, not live login status. Memory tip: think “list” for live logins—if the user’s IP isn’t in the list, FSSO polling hasn’t recognized them yet.
NSE4 Authentication and VPN Practice Question
This NSE4 practice question tests your understanding of authentication and vpn. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 administrator configures FSSO (Fortinet Single Sign-On) with Active Directory polling. Users report that their web traffic is being blocked by the firewall even though they are logged into the domain. Which CLI command can the administrator use to verify the FSSO login status for a specific user?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
diagnose debug authd fsso list
The command 'diagnose debug authd fsso list' displays all FSSO users currently known to FortiGate, including their IP addresses and login state. This is the primary command to verify if the user is recognized by FSSO.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
diagnose user fsso poll user <username>
Why it's wrong here
There is no such command. The correct command is 'diagnose debug authd fsso list'.
✗
diagnose wad user list
Why it's wrong here
This command shows web proxy users, not necessarily FSSO.
✓
diagnose debug authd fsso list
Why this is correct
Correct. This command lists all FSSO users with their IP addresses and group memberships.
Related concept
Read the scenario before looking for a memorised answer.
✗
diagnose test authserver ldap <server> <username>
Why it's wrong here
This tests LDAP authentication, not FSSO status.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
There is no such command. The correct command is 'diagnose debug authd fsso list'.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the NSE4 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
Got this wrong? Here's your next step.
Identify which NSE4 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Authentication and VPN — This question tests Authentication and VPN — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: diagnose debug authd fsso list — The command 'diagnose debug authd fsso list' displays all FSSO users currently known to FortiGate, including their IP addresses and login state. This is the primary command to verify if the user is recognized by FSSO.
What should I do if I get this NSE4 question wrong?
Identify which NSE4 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A FortiGate is configured with FSSO to poll Active Directory for user logon events. Users report that their logins are not being detected. What is the FIRST step to troubleshoot?
medium
A.Recreate all firewall policies
✓ B.Run 'diag debug fsso poll' to verify the collector agent status
C.Disable and re-enable FSSO
D.Restart the FortiGate firewall
Why B: The 'diag debug fsso poll' command shows the status of the FSSO collector agent and polling process, helping to identify issues.
Variation 2. A FortiGate with multiple VDOMs is configured for FSSO with Active Directory polling. Users in VDOM1 are authenticated correctly, but users in VDOM2 are not. What should be checked FIRST?
medium
A.The DNS resolution for the domain controller in VDOM2
B.The firewall policy ordering in VDOM2
✓ C.The FSSO collector agent settings for VDOM2
D.The LDAP server configuration in VDOM2
Why C: FSSO collector agents must be configured per VDOM. If VDOM2 does not have a collector agent or the poll interval is not set, user authentication will fail.
Last reviewed: Jun 21, 2026
Question Discussion
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This NSE4 practice question is part of Courseiva's free Fortinet 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 NSE4 exam.
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