Question 550
At Greenridge Insurance, the FortiGate 7.6 security administration team encounters the following authorized operational case: a computer is reused by another shift but FortiGate continues to match the previous person's FSSO login. They need a defensible FortiOS configuration, diagnosis, validation or prevention decision. What root condition most directly explains the described FortiGate symptom?
Explanation
Correct Answer
A passive session table can preserve an outdated user-to-IP association until a logout or timeout update arrives. The mechanism is relevant because the stated fsso logout cleanup incident concerns the actual selected path, policy, identity or inspection state. The appropriate response is to enable appropriate logoff detection and identity entry aging in the FSSO integration; verify it through this observed condition: a shift-change test removes the prior mapping and recognizes the new user correctly.
Incorrect Answers
A denied session may leave insufficient evidence when its matching firewall policy does not log traffic explains a different situation, deny policy traffic logging, where an internal application unexpectedly receives TCP resets but the broad deny policy has logging disabled. It does not account for the specific observed fsso logout cleanup condition at Greenridge Insurance. The decisive mechanism here is: A passive session table can preserve an outdated user-to-IP association until a logout or timeout update arrives.
One-to-one mapping does not supply address-port multiplexing for many simultaneous hosts explains a different situation, source nat overload pool, where many internal clients need outbound internet access but an engineer configures a single fixed one-to-one IP mapping for all of them. It does not account for the specific observed fsso logout cleanup condition at Greenridge Insurance. The decisive mechanism here is: A passive session table can preserve an outdated user-to-IP association until a logout or timeout update arrives.
DNAT changes an address but does not create a valid route to an unreachable internal destination explains a different situation, vip mapped address subnet gateway, where an administrator defines a public VIP to a mapped server on a disconnected internal subnet and assumes translation alone establishes the path. It does not account for the specific observed fsso logout cleanup condition at Greenridge Insurance. The decisive mechanism here is: A passive session table can preserve an outdated user-to-IP association until a logout or timeout update arrives.