Question 450
At Fairmont Energy Cooperative, the FortiGate 7.6 security administration team encounters the following authorized operational case: FortiGate fails LDAPS handshakes after the directory server's certificate rotates to a new internal issuing CA. They need a defensible FortiOS configuration, diagnosis, validation or prevention decision. What root condition most directly explains the described FortiGate symptom?
Explanation
Correct Answer
Encrypted LDAP authentication can fail before user lookup when certificate trust is invalid. The mechanism is relevant because the stated encrypted ldap ca trust incident concerns the actual selected path, policy, identity or inspection state. The appropriate response is to import and trust the approved directory CA chain and check LDAP TLS hostname settings; verify it through this observed condition: a verified LDAPS connection succeeds with the expected directory server identity.
Incorrect Answers
Unfiltered passive identity does not establish authorization for every corporate resource explains a different situation, fsso group exclusion safety, where an engineer broadens FSSO filters to every domain user to fix one application's access failure. It does not account for the specific observed encrypted ldap ca trust condition at Fairmont Energy Cooperative. The decisive mechanism here is: Encrypted LDAP authentication can fail before user lookup when certificate trust is invalid.
FortiGate policy evaluation follows ordered matching rules and can stop at an earlier broad matching action explains a different situation, top-down firewall policy matching, where an approved application flow is denied because a broad deny rule appears above a narrower intended allow rule. It does not account for the specific observed encrypted ldap ca trust condition at Fairmont Energy Cooperative. The decisive mechanism here is: Encrypted LDAP authentication can fail before user lookup when certificate trust is invalid.
Some cloud-service IP destinations change faster than static address objects are maintained explains a different situation, internet service database rule fit, where an enterprise tries to maintain hundreds of changing SaaS IPs manually for a FortiGuard-recognized service in an outbound rule. It does not account for the specific observed encrypted ldap ca trust condition at Fairmont Energy Cooperative. The decisive mechanism here is: Encrypted LDAP authentication can fail before user lookup when certificate trust is invalid.