The answer is to review the SSL/SSH inspection profile's certificate revocation check settings. When an HTTPS site is blocked despite the web filter allowing the category, the issue typically stems from the FortiGate’s inability to validate the server’s certificate revocation status via OCSP or CRL, causing the device to block the connection as a security precaution even though the URL category is permitted. On the Fortinet NSE 4 exam, this scenario tests your understanding of how SSL inspection interacts with web filtering—a common trap is assuming the problem lies in the URL category or policy order, when in fact the revocation check is the culprit. Remember that SSL inspection adds a layer of trust verification; if the certificate’s revocation status cannot be confirmed, the FortiGate errs on the side of blocking. Memory tip: “Revocation blocks, not the category”—if the site is allowed but still blocked, check the revocation settings first.
NSE4 Security Profiles Practice Question
This NSE4 practice question tests your understanding of security profiles. 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 administrator notices that traffic to a specific HTTPS website is being blocked. The FortiGate has SSL inspection enabled, and the web filter profile is set to monitor all categories. The URL is not in any blocked category. What should the administrator check next?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Review the SSL/SSH inspection profile's certificate revocation check settings.
When SSL inspection is enabled and a specific HTTPS site is blocked despite not being in a blocked category, the issue often lies in the SSL/SSH inspection profile's certificate revocation check. If the FortiGate cannot verify the server's certificate revocation status (e.g., via OCSP or CRL), it may block the connection as a security precaution, even if the web filter category allows the URL. Option B directly addresses this by suggesting a review of the revocation check settings.
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.
✗
Check if the SSL inspection policy is using certificate inspection instead of full SSL inspection.
Why it's wrong here
Certificate inspection still allows traffic; it just doesn't decrypt the payload.
✓
Review the SSL/SSH inspection profile's certificate revocation check settings.
Why this is correct
If the certificate is revoked, the FortiGate may block the connection.
Related concept
Read the scenario before looking for a memorised answer.
✗
Ensure that the FortiGate has the latest web filter database.
Why it's wrong here
An outdated database might miscategorize, but the administrator said it's not in a blocked category.
✗
Verify that the web filter has the correct rating for the URL.
Why it's wrong here
The administrator already confirmed the URL is not in a blocked category.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume HTTPS blocking is always due to web filter categories or inspection depth, overlooking that certificate revocation checks in the SSL inspection profile can independently block traffic even when the URL is allowed by the web filter.
Detailed technical explanation
How to think about this question
The FortiGate's SSL/SSH inspection profile can be configured to check certificate revocation status using OCSP (Online Certificate Status Protocol) or CRL (Certificate Revocation List). If the server's certificate is revoked or the revocation server is unreachable, the FortiGate may block the connection based on the 'allow' or 'block' action set for certificate validation failures. This is independent of web filtering, which operates at the application layer after SSL decryption, so a certificate revocation block can occur before the web filter even evaluates the URL.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Profiles — This question tests Security Profiles — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Review the SSL/SSH inspection profile's certificate revocation check settings. — When SSL inspection is enabled and a specific HTTPS site is blocked despite not being in a blocked category, the issue often lies in the SSL/SSH inspection profile's certificate revocation check. If the FortiGate cannot verify the server's certificate revocation status (e.g., via OCSP or CRL), it may block the connection as a security precaution, even if the web filter category allows the URL. Option B directly addresses this by suggesting a review of the revocation check settings.
What should I do if I get this NSE4 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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