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Question 454 of 516

Securing Users and Applications with Authentication →mediumMultiple ChoiceObjective-mapped

Captive Portal Authentication: Fixing Timeout and Session Cookie Issues

This PCNSE practice question tests your understanding of securing users and applications with authentication. 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.

Users are unable to authenticate via Captive Portal. The firewall receives authentication requests but they time out. What should be checked first?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

A
The certificate used for the Captive Portal page
Why wrong: A certificate issue causes SSL errors, not timeouts.
B
The session timeout for authenticated users
Why wrong: Session timeout affects post-authentication, not the auth process.
C
The authentication sequence settings in the Captive Portal configuration
If the sequence does not include reachable servers or has incorrect priorities, authentication requests may time out.
D
The User-ID agent mapping
Why wrong: User-ID agent does not affect authentication requests in Captive Portal.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The authentication sequence settings in the Captive Portal configuration

Option C is correct because when the firewall receives authentication requests but they time out, the most common cause is a misconfigured authentication sequence. The authentication sequence defines the order of authentication methods (e.g., local database, RADIUS, LDAP) and their timeout settings. If the sequence is incorrect or the servers are unreachable, the firewall will wait for a response until the timeout expires, causing the Captive Portal authentication to fail. Checking this first isolates the issue efficiently before investigating other components.

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.

✗
The certificate used for the Captive Portal page
Why it's wrong here
A certificate issue causes SSL errors, not timeouts.
✗
The session timeout for authenticated users
Why it's wrong here
Session timeout affects post-authentication, not the auth process.
✓
The authentication sequence settings in the Captive Portal configuration
Why this is correct
If the sequence does not include reachable servers or has incorrect priorities, authentication requests may time out.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The User-ID agent mapping
Why it's wrong here
User-ID agent does not affect authentication requests in Captive Portal.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often jump to checking the certificate (Option A) because Captive Portal uses HTTPS, but the timeout symptom specifically indicates a backend authentication server issue, not a certificate problem.

Detailed technical explanation

How to think about this question

Under the hood, the Captive Portal authentication sequence uses a list of authentication profiles (e.g., RADIUS, LDAP, local) with configurable timeouts per server. When a user submits credentials, the firewall sends an Access-Request (RADIUS) or bind request (LDAP) and waits for a response. If the server is unreachable or the sequence is misordered (e.g., a slow server listed first), the firewall will wait for the per-server timeout (default 10 seconds) before trying the next method, leading to a perceived timeout. In real-world scenarios, a common mistake is placing an unreachable LDAP server before a working RADIUS server, causing all authentication attempts to fail with a timeout.

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.

TExam Day Tips

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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.

Quick reference

AAA Protocol Comparison

Protocol	Port(s)	Encryption	Transport	Primary Use
RADIUS	1812 / 1813	Password only	UDP	Network access control
TACACS+	49	Full packet	TCP	Device administration
Diameter	3868	Full session	TCP / SCTP	Carrier / mobile networks
802.1X	—	EAP-based	Layer 2	Port-based access control

TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this PCNSE question test?

Securing Users and Applications with Authentication — This question tests Securing Users and Applications with Authentication — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The authentication sequence settings in the Captive Portal configuration — Option C is correct because when the firewall receives authentication requests but they time out, the most common cause is a misconfigured authentication sequence. The authentication sequence defines the order of authentication methods (e.g., local database, RADIUS, LDAP) and their timeout settings. If the sequence is incorrect or the servers are unreachable, the firewall will wait for a response until the timeout expires, causing the Captive Portal authentication to fail. Checking this first isolates the issue efficiently before investigating other components.

What should I do if I get this PCNSE question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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Same concept, more angles

1 more ways this is tested on PCNSE

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. An organization uses captive portal authentication. Users report that after closing the browser, they are still authenticated and can access resources without re-authenticating. How can the administrator enforce re-authentication after browser closure?

medium

✓ A.Clear the 'allow session cookie' option in the captive portal profile.
B.Configure the authentication enforcement to require authentication for each session.
C.Set the session timeout to 0 in the captive portal profile.
D.Disable the 'session cookie' setting in the captive portal profile and change the authentication profile to use RADIUS.

Why A: Captive portal uses a session cookie to maintain authentication. Clearing the 'allow session cookie' option forces the user to authenticate for each new browser session. Option A is correct.

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This PCNSE practice question is part of Courseiva's free Palo Alto Networks 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 PCNSE exam.