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Inspect object IP ranges, DNS resolution for dynamic objects, zone membership, custom service ports and protocol, schedule objects and effective policy matches. This diagnostic is related to Address and service objects, interface zones, and policy scoping rather than the controlling evidence for this scenario. Examine instead: Inspect LDAPS connection and certificate trust, directory bind status, search base, user attributes, group membership and authentication test output. Scenario: FortiGate's LDAP test returns a connection but remote finance users never match the firewall group because the group DN search base is wrong.

Inspect ordered policy IDs, ingress and egress interfaces, address groups, services, source users, policy hit counters and session debug messages. This diagnostic is related to Firewall policy evaluation order, interfaces and least privilege rather than the controlling evidence for this scenario. Examine instead: Inspect LDAPS connection and certificate trust, directory bind status, search base, user attributes, group membership and authentication test output. Scenario: FortiGate's LDAP test returns a connection but remote finance users never match the firewall group because the group DN search base is wrong.

Review authenticated user monitor, auth method, group sources, user-to-IP mapping, identity timeout, traffic source IP and matching policy ID. This diagnostic is related to Active versus passive FortiGate authentication evidence rather than the controlling evidence for this scenario. Examine instead: Inspect LDAPS connection and certificate trust, directory bind status, search base, user attributes, group membership and authentication test output. Scenario: FortiGate's LDAP test returns a connection but remote finance users never match the firewall group because the group DN search base is wrong.

Isolate FSSO group-policy failures by tracing directory login events to collector tables and FortiGate identity records before altering the protected firewall policy. This addresses FSSO troubleshooting and authentication connector health, but not the principal task of the described flow. A firewall policy allowing any user is an unsafe substitute for repairing a failed identity collector; authentication is a separate dependency from packet route reachability. The better fit is: Arrange specific FortiGate firewall rules above broad rules with correct source, destination, interface, service and schedule matching, and leave an auditable implicit-deny boundary. Scenario: A new finance application rule names the correct destination subnet but the wrong incoming VLAN interface, leading debug flow to show no matching allow policy.

Deploy and validate a supported Fortinet Single Sign-On collector and domain-controller event source, ensuring logon events reach the correct FortiGate connector. This addresses FSSO collector agent and domain-controller event acquisition, but not the principal task of the described flow. FSSO identifies users from login events rather than interrogating the user at every new TCP connection; a broken collector can leave stale or missing identities. The better fit is: Arrange specific FortiGate firewall rules above broad rules with correct source, destination, interface, service and schedule matching, and leave an auditable implicit-deny boundary. Scenario: A new finance application rule names the correct destination subnet but the wrong incoming VLAN interface, leading debug flow to show no matching allow policy.

Enable the intended logging options on relevant FortiGate allow and deny policies, then correlate explicit and implicit deny handling with counters and session evidence. This addresses Implicit denial, policy logging and rule hit interpretation, but not the principal task of the described flow. An implicit firewall deny may have different log visibility than an explicit deny; no traffic log is not reliable evidence that a packet never reached the FortiGate. The better fit is: Arrange specific FortiGate firewall rules above broad rules with correct source, destination, interface, service and schedule matching, and leave an auditable implicit-deny boundary. Scenario: A new finance application rule names the correct destination subnet but the wrong incoming VLAN interface, leading debug flow to show no matching allow policy.

Create supported FortiOS SD-WAN member links and zones with appropriate routes and performance health checks, validating per-member interface and gateway settings. This choice relates to FortiGate SD-WAN members, zones and health-check design, not the complementary implementation-and-evidence pair for the case. Implement: Validate the explicit and implicit FortiOS SD-WAN service-rule ordering, fallbacks and session behavior under primary member failure and subsequent recovery. Check: Inspect SD-WAN rules in evaluation order, default service strategy, member health, route table, session interface selection and event history. Scenario: An ISP circuit fails while active sessions continue pointing at its original member until the FortiGate detects the failure and supports reconnection.

Inspect monitor target, probe protocol, gateway link state, route suppression, recovery thresholds, event log and controlled failover timings. This choice relates to Link monitoring and static route failover triggers, not the complementary implementation-and-evidence pair for the case. Implement: Validate the explicit and implicit FortiOS SD-WAN service-rule ordering, fallbacks and session behavior under primary member failure and subsequent recovery. Check: Inspect SD-WAN rules in evaluation order, default service strategy, member health, route table, session interface selection and event history. Scenario: An ISP circuit fails while active sessions continue pointing at its original member until the FortiGate detects the failure and supports reconnection.

The preferred route is selected under normal conditions and documented alternates take over consistently when the primary path is unusable. This choice relates to Static route priority, administrative distance and ECMP design, not the complementary implementation-and-evidence pair for the case. Implement: Validate the explicit and implicit FortiOS SD-WAN service-rule ordering, fallbacks and session behavior under primary member failure and subsequent recovery. Check: Inspect SD-WAN rules in evaluation order, default service strategy, member health, route table, session interface selection and event history. Scenario: An ISP circuit fails while active sessions continue pointing at its original member until the FortiGate detects the failure and supports reconnection.

Use supported policy-based SNAT or central SNAT options with interface address or appropriate IP pools, ensuring return traffic and overlapping network requirements are considered. This addresses Policy NAT source translation and IP pool selection, but not the principal task of the described flow. NAT is address translation, not a permit decision; a working outbound policy still needs correct return routing and enough translated addresses and ports. The better fit is: Use a supported FortiGate captive portal or identity-aware authentication policy to identify users before applying restricted network access, testing redirection and session lifetime. Scenario: Guest users have unrestricted internet access without the intended captive portal because an earlier open policy matches their subnet first.

Configure a supported RADIUS server and shared secrets for user authentication, interpreting Access-Accept, Access-Reject, timeout and group attributes before changing network policy. This addresses RADIUS authentication and policy-bound MFA validation, but not the principal task of the described flow. A reachable RADIUS server can still reject every user if the shared secret, client registration, user group mapping or MFA flow is incorrect. The better fit is: Use a supported FortiGate captive portal or identity-aware authentication policy to identify users before applying restricted network access, testing redirection and session lifetime. Scenario: Guest users have unrestricted internet access without the intended captive portal because an earlier open policy matches their subnet first.

Connect FortiGate to the intended LDAP directory over a verified encrypted transport, with correct base DN, bind account and group mappings for firewall authentication. This addresses LDAP remote user integration over trusted TLS, but not the principal task of the described flow. A successful TCP connection to a directory server does not establish that LDAP bind identity, group lookup or TLS certificate validation is correct. The better fit is: Use a supported FortiGate captive portal or identity-aware authentication policy to identify users before applying restricted network access, testing redirection and session lifetime. Scenario: Guest users have unrestricted internet access without the intended captive portal because an earlier open policy matches their subnet first.

Examine original and translated tuple in the FortiOS session table, chosen policy ID, VIP match, SD-WAN route, source interface and TCP handshake packets. This choice relates to Diagnosing translated session return path and policy NAT mismatches, not the complementary implementation-and-evidence pair for the case. Implement: Design supported NAT loopback or split-horizon DNS for internal clients that use a service's public VIP, validating both destination and source translation where required. Check: Check client DNS answer, ingress/internal interfaces, VIP external address match, matched firewall policy, reverse session and asymmetric return packets. Scenario: An internal client opens a session to its server using the public VIP but the server replies directly to the client subnet, bypassing the expected NAT return path.

Use supported policy-based SNAT or central SNAT options with interface address or appropriate IP pools, ensuring return traffic and overlapping network requirements are considered. This choice relates to Policy NAT source translation and IP pool selection, not the complementary implementation-and-evidence pair for the case. Implement: Design supported NAT loopback or split-horizon DNS for internal clients that use a service's public VIP, validating both destination and source translation where required. Check: Check client DNS answer, ingress/internal interfaces, VIP external address match, matched firewall policy, reverse session and asymmetric return packets. Scenario: An internal client opens a session to its server using the public VIP but the server replies directly to the client subnet, bypassing the expected NAT return path.

Authorized users receive the intended group or MFA result and unauthorized or unavailable-server attempts fail according to explicit policy. This choice relates to RADIUS authentication and policy-bound MFA validation, not the complementary implementation-and-evidence pair for the case. Implement: Design supported NAT loopback or split-horizon DNS for internal clients that use a service's public VIP, validating both destination and source translation where required. Check: Check client DNS answer, ingress/internal interfaces, VIP external address match, matched firewall policy, reverse session and asymmetric return packets. Scenario: An internal client opens a session to its server using the public VIP but the server replies directly to the client subnet, bypassing the expected NAT return path.

Inspect SD-WAN member status, zone membership, performance SLA targets, latency/jitter/loss, route presence and monitoring events. This diagnostic is related to FortiGate SD-WAN members, zones and health-check design rather than the controlling evidence for this scenario. Examine instead: Inspect FIB route selection, source and destination prefixes, reverse path, configured policy routes, ingress interface and paired packet traces. Scenario: A more-specific route for a partner address range points to a retired VPN, overriding the otherwise working default route and breaking only that service.

Inspect routing monitor, static route enablement, interface link, neighbor ARP, gateway reachability, destination prefixes and diagnostic route lookups. This diagnostic is related to FortiGate static default routes and interface reachability rather than the controlling evidence for this scenario. Examine instead: Inspect FIB route selection, source and destination prefixes, reverse path, configured policy routes, ingress interface and paired packet traces. Scenario: A more-specific route for a partner address range points to a retired VPN, overriding the otherwise working default route and breaking only that service.

Inspect monitor target, probe protocol, gateway link state, route suppression, recovery thresholds, event log and controlled failover timings. This diagnostic is related to Link monitoring and static route failover triggers rather than the controlling evidence for this scenario. Examine instead: Inspect FIB route selection, source and destination prefixes, reverse path, configured policy routes, ingress interface and paired packet traces. Scenario: A more-specific route for a partner address range points to a retired VPN, overriding the otherwise working default route and breaking only that service.

Apply FortiOS antivirus profiles and protocol options in the supported inspection mode on the relevant firewall policies, with suitable FortiGuard definitions and HTTPS visibility. This addresses Antivirus profile scanning modes and supported protocol boundaries, but not the principal task of the described flow. An antivirus profile can only scan content visible in its inspection path and within supported protocol or size limits; a scanner configured but unattached is ineffective. The better fit is: Verify that security policies for TLS downloads use appropriate deep inspection, antivirus scanning and certificate handling, restricting bypasses to narrowly documented incompatible services. Scenario: A browser displays a FortiGate-generated certificate warning during full inspection and staff are told to ignore it instead of fixing endpoint trust distribution.

Set supported protocol and file-size inspection thresholds according to policy, explicitly handling oversized, compressed or unsupported transfers without silently failing open. This addresses Oversized transfer handling and antivirus inspection limits, but not the principal task of the described flow. An allowed oversize bypass can create a malware scanning gap even though the AV profile is enabled for smaller files; archive depth changes effective inspection capability. The better fit is: Verify that security policies for TLS downloads use appropriate deep inspection, antivirus scanning and certificate handling, restricting bypasses to narrowly documented incompatible services. Scenario: A browser displays a FortiGate-generated certificate warning during full inspection and staff are told to ignore it instead of fixing endpoint trust distribution.

Measure FortiOS IPS engine and appliance resource load under representative traffic before changing signature sets or SSL inspection scope, keeping protection while isolating bottlenecks. This addresses IPS process CPU demand and inspection capacity, but not the principal task of the described flow. An IPS workload may be CPU-bound on a particular model or traffic mix, and disabling all sensors is not a diagnosis of the expensive signature or protocol path. The better fit is: Verify that security policies for TLS downloads use appropriate deep inspection, antivirus scanning and certificate handling, restricting bypasses to narrowly documented incompatible services. Scenario: A browser displays a FortiGate-generated certificate warning during full inspection and staff are told to ignore it instead of fixing endpoint trust distribution.

Traffic between the intended protected subnet pairs installs valid child security associations and rekeys without repeated interruptions. This result would test Phase 2 selectors, PFS and encryption lifecycle but does not demonstrate the desired FortiGate outcome here. Verify instead: The failure is attributed to the correct negotiation or data-path layer and a tested remediation restores encrypted application traffic. Scenario: Two peers repeatedly establish Phase 1 then log Phase 2 NO_PROPOSAL_CHOSEN errors; administrators waste time changing firewall address objects instead of matching proposals.

Authorized workloads cross the inspection interfaces and return through a symmetric allowed path rather than bypassing the FortiGate VM or being blackholed. This result would test FortiGate VM in public-cloud route and interface topology but does not demonstrate the desired FortiGate outcome here. Verify instead: The failure is attributed to the correct negotiation or data-path layer and a tested remediation restores encrypted application traffic. Scenario: Two peers repeatedly establish Phase 1 then log Phase 2 NO_PROPOSAL_CHOSEN errors; administrators waste time changing firewall address objects instead of matching proposals.

The appliance completes the planned upgrade with firewall rules and connectivity preserved, and administrators can restore a tested configuration if a change fails. This result would test Configuration backups and controlled FortiOS firmware changes but does not demonstrate the desired FortiGate outcome here. Verify instead: The failure is attributed to the correct negotiation or data-path layer and a tested remediation restores encrypted application traffic. Scenario: Two peers repeatedly establish Phase 1 then log Phase 2 NO_PROPOSAL_CHOSEN errors; administrators waste time changing firewall address objects instead of matching proposals.

Use FortiOS SD-WAN service rules with appropriate quality measurements and priority strategy to select links for latency-sensitive or bulk applications. This addresses SD-WAN application steering by performance SLA thresholds, but not the principal task of the described flow. A link showing the highest bandwidth is not necessarily the best choice for latency-sensitive traffic, and SD-WAN SLA measurements must match actual critical paths. The better fit is: Investigate FortiOS SD-WAN anomalies through rule match, health-check statistics, session tables and routing diagnostics before changing priorities or disabling monitoring. Scenario: An administrator clears all SD-WAN health monitors to force a failover, losing the diagnostic evidence needed to identify whether one member or the probe destination actually failed.

Coordinate FortiGate firewall policies and SD-WAN zones with route or application-based service steering so chosen WAN members are compatible with the intended security and NAT policy. This addresses SD-WAN interactions with firewall policies and source-specific routes, but not the principal task of the described flow. Traffic must pass both policy and routing requirements; a correctly configured SD-WAN rule cannot override a denied firewall session or fix missing NAT. The better fit is: Investigate FortiOS SD-WAN anomalies through rule match, health-check statistics, session tables and routing diagnostics before changing priorities or disabling monitoring. Scenario: An administrator clears all SD-WAN health monitors to force a failover, losing the diagnostic evidence needed to identify whether one member or the probe destination actually failed.

Attach supported FortiOS gateway or link-health checks to redundant routes and verify that route withdrawal or selection responds to actual upstream reachability failure. This addresses Link monitoring and static route failover triggers, but not the principal task of the described flow. Ethernet carrier status is insufficient to prove internet reachability past an ISP modem, and an incorrect monitor target can create false failovers. The better fit is: Investigate FortiOS SD-WAN anomalies through rule match, health-check statistics, session tables and routing diagnostics before changing priorities or disabling monitoring. Scenario: An administrator clears all SD-WAN health monitors to force a failover, losing the diagnostic evidence needed to identify whether one member or the probe destination actually failed.

Compare collector monitored groups, AD membership, security identifier/group names, group refresh status, FortiGate group objects and policy group references. This diagnostic is related to FSSO group filters and AD membership reconciliation rather than the controlling evidence for this scenario. Examine instead: Examine Phase 2 source and destination selectors, PFS group, ESP proposal, SA lifetimes, phase negotiation events and counters for protected prefixes. Scenario: Two FortiGates disagree on the PFS group for ESP negotiation, causing repeated child-SA failures while IKE negotiation succeeds.

Inspect tunnel interface status, active static or dynamic routes, firewall source and destination interfaces, NAT settings, selectors and session diagnostics. This diagnostic is related to Route-based IPsec tunnel interface and matching security policies rather than the controlling evidence for this scenario. Examine instead: Examine Phase 2 source and destination selectors, PFS group, ESP proposal, SA lifetimes, phase negotiation events and counters for protected prefixes. Scenario: Two FortiGates disagree on the PFS group for ESP negotiation, causing repeated child-SA failures while IKE negotiation succeeds.

Inspect FortiAnalyzer registration and authorization, connectivity, device identity, log forwarding state, log types, policy logging settings and timestamps. This diagnostic is related to FortiAnalyzer registration and centralized log forwarding rather than the controlling evidence for this scenario. Examine instead: Examine Phase 2 source and destination selectors, PFS group, ESP proposal, SA lifetimes, phase negotiation events and counters for protected prefixes. Scenario: Two FortiGates disagree on the PFS group for ESP negotiation, causing repeated child-SA failures while IKE negotiation succeeds.

Inspect the active route table, equal-prefix candidates, distance values, priorities, ECMP status, next-hop reachability and matching interface state. This diagnostic is related to Static route priority, administrative distance and ECMP design rather than the controlling evidence for this scenario. Examine instead: Inspect routing monitor, static route enablement, interface link, neighbor ARP, gateway reachability, destination prefixes and diagnostic route lookups. Scenario: A FortiGate internet policy is enabled but client traffic fails because the WAN default route still points at the old ISP gateway after circuit replacement.

Inspect FIB route selection, source and destination prefixes, reverse path, configured policy routes, ingress interface and paired packet traces. This diagnostic is related to Routing table and reverse-path asymmetric connectivity analysis rather than the controlling evidence for this scenario. Examine instead: Inspect routing monitor, static route enablement, interface link, neighbor ARP, gateway reachability, destination prefixes and diagnostic route lookups. Scenario: A FortiGate internet policy is enabled but client traffic fails because the WAN default route still points at the old ISP gateway after circuit replacement.

Examine source/destination firewall policy, SD-WAN zone, NAT behavior, explicit policy routes, application signature, health check and session egress. This diagnostic is related to SD-WAN interactions with firewall policies and source-specific routes rather than the controlling evidence for this scenario. Examine instead: Inspect routing monitor, static route enablement, interface link, neighbor ARP, gateway reachability, destination prefixes and diagnostic route lookups. Scenario: A FortiGate internet policy is enabled but client traffic fails because the WAN default route still points at the old ISP gateway after circuit replacement.