Question 570
At Harborview University, the FortiGate 7.6 security administration team encounters the following authorized operational case: a FortiGate deep-inspection CA certificate expires during a maintenance freeze and browsers stop trusting generated site certificates. They need a defensible FortiOS configuration, diagnosis, validation or prevention decision. What root condition most directly explains the described FortiGate symptom?
Explanation
Correct Answer
Inspection trust fails when substituted certificates chain to an expired or no longer accepted issuing identity. The mechanism is relevant because the stated tls inspection certificate expiration incident concerns the actual selected path, policy, identity or inspection state. The appropriate response is to renew and deploy the compatible inspection CA and update managed client trust in an approved sequence; verify it through this observed condition: a test client validates current inspection certificates and security filtering remains active.
Incorrect Answers
Category monitor records a match but does not deny access unless the configured action requires it explains a different situation, fortiguard category deny, where student browsing rules allow gambling websites because a FortiGuard web filter profile has that category set to monitor. It does not account for the specific observed tls inspection certificate expiration condition at Harborview University. The decisive mechanism here is: Inspection trust fails when substituted certificates chain to an expired or no longer accepted issuing identity.
A configured security profile has no effect on flows that never traverse a policy referencing it explains a different situation, web filter profile not applied, where a newly created marketing category profile is correct but social-network sites are unaffected on the production VLAN. It does not account for the specific observed tls inspection certificate expiration condition at Harborview University. The decisive mechanism here is: Inspection trust fails when substituted certificates chain to an expired or no longer accepted issuing identity.
A broad exemption can suppress inspection for unrelated traffic sharing the allowed domain scope explains a different situation, webfilter exemption policy scope, where a site-level SSL inspection exemption expands to an entire content-delivery domain and unexpectedly bypasses other security scanning. It does not account for the specific observed tls inspection certificate expiration condition at Harborview University. The decisive mechanism here is: Inspection trust fails when substituted certificates chain to an expired or no longer accepted issuing identity.