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Inspect authentication rule order, captive portal URL and certificate, user group, browser redirect behavior, session authentication list and logout/timeout timestamps. This diagnostic is related to Captive portal and explicit firewall user authentication 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: An operator disables LDAPS certificate verification after rotating the directory server certificate, risking credentials rather than correcting CA trust.

Inspect collector connectivity, DC agent or polling status, directory event permissions, group filters, collector learned user/IP mappings and FortiGate FSSO server state. This diagnostic is related to FSSO collector agent and domain-controller event acquisition 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: An operator disables LDAPS certificate verification after rotating the directory server certificate, risking credentials rather than correcting CA trust.

Check client DNS answer, ingress/internal interfaces, VIP external address match, matched firewall policy, reverse session and asymmetric return packets. This diagnostic is related to NAT hairpin and internal use of public VIP names 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: An operator disables LDAPS certificate verification after rotating the directory server certificate, risking credentials rather than correcting CA trust.

Important traffic and security logs persist for the required investigation period and missing or delayed export produces observable alerts. This result would test FortiGate local log storage and reliable export but does not demonstrate the desired FortiGate outcome here. Verify instead: Approved VPN peers authenticate and rotate keys or certificates without accepting expired, revoked or unexpected identities and while maintaining tested availability. Scenario: An administrator turns off peer-ID validation to silence a certificate identity mismatch rather than coordinating the expected peer name and issuing CA with the partner.

A test flow shows symmetric forward and return tuples, correct NAT mappings and stable application transactions through the intended policy. This result would test Diagnosing translated session return path and policy NAT mismatches but does not demonstrate the desired FortiGate outcome here. Verify instead: Approved VPN peers authenticate and rotate keys or certificates without accepting expired, revoked or unexpected identities and while maintaining tested availability. Scenario: An administrator turns off peer-ID validation to silence a certificate identity mismatch rather than coordinating the expected peer name and issuing CA with the partner.

The failure is attributed to the correct negotiation or data-path layer and a tested remediation restores encrypted application traffic. This result would test IKE and IPsec debug evidence for Phase 1 versus child-SA failures but does not demonstrate the desired FortiGate outcome here. Verify instead: Approved VPN peers authenticate and rotate keys or certificates without accepting expired, revoked or unexpected identities and while maintaining tested availability. Scenario: An administrator turns off peer-ID validation to silence a certificate identity mismatch rather than coordinating the expected peer name and issuing CA with the partner.

Provide out-of-band access to each HA member through supported reserved management interfaces, and stage firmware upgrades with cluster health and rollback checks. This addresses Reserved HA management, monitoring and firmware upgrades, but not the principal task of the described flow. Access to the virtual cluster primary is not the same as independent access to each physical peer, and an HA firmware upgrade requires build compatibility and sequence planning. The better fit is: Choose supported FortiGate Cloud-Native Firewall integration when centralized cloud firewall policies and service-managed dataplane fit the project, rather than assuming CNF is a self-managed FortiGate VM. Scenario: After cloud account permissions change, FortiGate CNF can no longer discover protected network resources even though its last policy configuration remains visible.

Validate supported FortiGate-VM entitlement, public-cloud capacity requirements and cloud security policies before cutover, distinguishing vendor appliance configuration from cloud platform permissions. This addresses Cloud FortiGate licensing and infrastructure ownership boundaries, but not the principal task of the described flow. An active FortiOS license does not confer AWS or Azure rights, and an allowed firewall rule cannot override a cloud-native deny or missing route. The better fit is: Choose supported FortiGate Cloud-Native Firewall integration when centralized cloud firewall policies and service-managed dataplane fit the project, rather than assuming CNF is a self-managed FortiGate VM. Scenario: After cloud account permissions change, FortiGate CNF can no longer discover protected network resources even though its last policy configuration remains visible.

Trace a permitted test flow using FortiOS interface status, routing tables, packet sniffers, session tables and narrowly scoped debug flow, then stop diagnostics safely. This addresses Packet capture, debug flow and physical-path investigation, but not the principal task of the described flow. A ping from the FortiGate control plane may use a different source and route than user traffic; overbroad live debug capture can also expose sensitive packets or strain production. The better fit is: Choose supported FortiGate Cloud-Native Firewall integration when centralized cloud firewall policies and service-managed dataplane fit the project, rather than assuming CNF is a self-managed FortiGate VM. Scenario: After cloud account permissions change, FortiGate CNF can no longer discover protected network resources even though its last policy configuration remains visible.

Review cloud vNIC and subnet placement, effective cloud routes, source/destination checks where applicable, FortiOS interface addresses, security groups and return-path symmetry. This choice relates to FortiGate VM in public-cloud route and interface topology, not the complementary implementation-and-evidence pair for the case. Implement: Use FortiOS process and resource diagnostics to isolate sustained CPU load, distinguishing normal packet processing from logging, security scanning or runaway control-plane tasks. Check: Examine diagnose sys top or equivalent supported process views, CPU load by core, session throughput, UTM process consumption, interrupts and incident timestamps. Scenario: At month-end the firewall becomes sluggish, and one administrator disables every IPS sensor because aggregate CPU reached 90 percent without looking at process statistics.

Both eligible peers join the intended cluster, remain synchronized and elect the expected primary during controlled failover testing. This choice relates to FGCP cluster heartbeat, synchronization and election settings, not the complementary implementation-and-evidence pair for the case. Implement: Use FortiOS process and resource diagnostics to isolate sustained CPU load, distinguishing normal packet processing from logging, security scanning or runaway control-plane tasks. Check: Examine diagnose sys top or equivalent supported process views, CPU load by core, session throughput, UTM process consumption, interrupts and incident timestamps. Scenario: At month-end the firewall becomes sluggish, and one administrator disables every IPS sensor because aggregate CPU reached 90 percent without looking at process statistics.

Trace a permitted test flow using FortiOS interface status, routing tables, packet sniffers, session tables and narrowly scoped debug flow, then stop diagnostics safely. This choice relates to Packet capture, debug flow and physical-path investigation, not the complementary implementation-and-evidence pair for the case. Implement: Use FortiOS process and resource diagnostics to isolate sustained CPU load, distinguishing normal packet processing from logging, security scanning or runaway control-plane tasks. Check: Examine diagnose sys top or equivalent supported process views, CPU load by core, session throughput, UTM process consumption, interrupts and incident timestamps. Scenario: At month-end the firewall becomes sluggish, and one administrator disables every IPS sensor because aggregate CPU reached 90 percent without looking at process statistics.

Inspect URL rating lookup, category database update, applied web filter rule, local rating override, browser result and web-filter log. This diagnostic is related to FortiGuard category ratings and controlled recategorization rather than the controlling evidence for this scenario. Examine instead: Examine FortiGuard category decision, encrypted request behavior, SSL inspection profile, server name/certificate, protocol handling and web-filter event fields. Scenario: Web-filter logs show a category deny for the server host while management interprets the record as proof of which encrypted document the user opened.

Inspect application category membership, application-specific overrides, signature IDs, traffic matches, session logs and inspection visibility. This diagnostic is related to Application category filters and application-specific enforcement rather than the controlling evidence for this scenario. Examine instead: Examine FortiGuard category decision, encrypted request behavior, SSL inspection profile, server name/certificate, protocol handling and web-filter event fields. Scenario: Web-filter logs show a category deny for the server host while management interprets the record as proof of which encrypted document the user opened.

Check inspection CA selection, certificate lifetime and chain, endpoint trust-store deployment, private-key controls, browser warnings and handshake logs. This diagnostic is related to FortiGate deep-inspection CA trust and certificate deployment rather than the controlling evidence for this scenario. Examine instead: Examine FortiGuard category decision, encrypted request behavior, SSL inspection profile, server name/certificate, protocol handling and web-filter event fields. Scenario: Web-filter logs show a category deny for the server host while management interprets the record as proof of which encrypted document the user opened.

Inspect SSL inspection mode, matched policy, negotiated TLS version, inspected application certificate, session log and target protocol support. This diagnostic is related to FortiGate certificate inspection versus full SSL/SSH inspection rather than the controlling evidence for this scenario. Examine instead: Check inspection CA selection, certificate lifetime and chain, endpoint trust-store deployment, private-key controls, browser warnings and handshake logs. Scenario: During inspection CA rotation, some laptops trust only the retired CA and cannot establish HTTPS connections through the newly configured firewall profile.

Inspect URL rating lookup, category database update, applied web filter rule, local rating override, browser result and web-filter log. This diagnostic is related to FortiGuard category ratings and controlled recategorization rather than the controlling evidence for this scenario. Examine instead: Check inspection CA selection, certificate lifetime and chain, endpoint trust-store deployment, private-key controls, browser warnings and handshake logs. Scenario: During inspection CA rotation, some laptops trust only the retired CA and cannot establish HTTPS connections through the newly configured firewall profile.

Review policy flow/proxy mode, web filter profile, SSL inspection depth, web request metadata, FortiGuard rating and matching event logs. This diagnostic is related to Flow-based versus proxy-based web filter enforcement rather than the controlling evidence for this scenario. Examine instead: Check inspection CA selection, certificate lifetime and chain, endpoint trust-store deployment, private-key controls, browser warnings and handshake logs. Scenario: During inspection CA rotation, some laptops trust only the retired CA and cannot establish HTTPS connections through the newly configured firewall profile.

Inspect SD-WAN service status, health-check latency/loss, member availability, session selected interface, forward route, transport packet trace and logs. This diagnostic is related to SD-WAN diagnostics, route changes and link-quality evidence rather than the controlling evidence for this scenario. Examine instead: Examine source/destination firewall policy, SD-WAN zone, NAT behavior, explicit policy routes, application signature, health check and session egress. Scenario: A source-specific route inherited from a migration diverts traffic before the intended SD-WAN policy and is mistaken for a broken link SLA.

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: Examine source/destination firewall policy, SD-WAN zone, NAT behavior, explicit policy routes, application signature, health check and session egress. Scenario: A source-specific route inherited from a migration diverts traffic before the intended SD-WAN policy and is mistaken for a broken link SLA.

Review matched SD-WAN service rule, SLA thresholds, measured jitter/loss/latency, session destination, selected member and failover behavior. This diagnostic is related to SD-WAN application steering by performance SLA thresholds rather than the controlling evidence for this scenario. Examine instead: Examine source/destination firewall policy, SD-WAN zone, NAT behavior, explicit policy routes, application signature, health check and session egress. Scenario: A source-specific route inherited from a migration diverts traffic before the intended SD-WAN policy and is mistaken for a broken link SLA.

Inspect authentication rule order, captive portal URL and certificate, user group, browser redirect behavior, session authentication list and logout/timeout timestamps. This diagnostic is related to Captive portal and explicit firewall user authentication rather than the controlling evidence for this scenario. Examine instead: Compare collector monitored groups, AD membership, security identifier/group names, group refresh status, FortiGate group objects and policy group references. Scenario: A directory team renames a group used in FSSO policy without updating corresponding collector filters, causing authorized access to disappear unexpectedly.

Inspect user login record, workstation lease, FSSO IP mapping, authentication cache age, NAT visibility, terminal service mappings and policy match logs. This diagnostic is related to FSSO user-to-IP identity across DHCP and shared networks rather than the controlling evidence for this scenario. Examine instead: Compare collector monitored groups, AD membership, security identifier/group names, group refresh status, FortiGate group objects and policy group references. Scenario: A directory team renames a group used in FSSO policy without updating corresponding collector filters, causing authorized access to disappear unexpectedly.

Examine FSSO agent status, polling event backlog, collector filters, clock skew, affected user/IP mapping, session age and matching policy logs. This diagnostic is related to FSSO troubleshooting and authentication connector health rather than the controlling evidence for this scenario. Examine instead: Compare collector monitored groups, AD membership, security identifier/group names, group refresh status, FortiGate group objects and policy group references. Scenario: A directory team renames a group used in FSSO policy without updating corresponding collector filters, causing authorized access to disappear unexpectedly.

Choose certificate-only or supported deep SSL/SSH inspection according to required visibility and data-handling policy, assigning the correct profile to matching firewall policies. This choice relates to FortiGate certificate inspection versus full SSL/SSH inspection, not the complementary implementation-and-evidence pair for the case. Implement: Apply narrowly scoped, auditable SSL-inspection exclusions for supported certificate-pinned or regulated applications without disabling inspection for every other destination. Check: Inspect exemption target entries, application URL or certificate behavior, matched firewall policy, destination reputation and security logs before and after exception. Scenario: A medical portal must not expose regulated patient payloads to a middlebox, yet the existing firewall configuration forces decryption for the entire category without privacy review.

An incorrectly classified approved site receives a narrow documented exception while disallowed categories continue to be blocked for the intended groups. This choice relates to FortiGuard category ratings and controlled recategorization, not the complementary implementation-and-evidence pair for the case. Implement: Apply narrowly scoped, auditable SSL-inspection exclusions for supported certificate-pinned or regulated applications without disabling inspection for every other destination. Check: Inspect exemption target entries, application URL or certificate behavior, matched firewall policy, destination reputation and security logs before and after exception. Scenario: A medical portal must not expose regulated patient payloads to a middlebox, yet the existing firewall configuration forces decryption for the entire category without privacy review.

Examine FortiGuard category decision, encrypted request behavior, SSL inspection profile, server name/certificate, protocol handling and web-filter event fields. This choice relates to HTTPS web filtering hostname limitations and logging, not the complementary implementation-and-evidence pair for the case. Implement: Apply narrowly scoped, auditable SSL-inspection exclusions for supported certificate-pinned or regulated applications without disabling inspection for every other destination. Check: Inspect exemption target entries, application URL or certificate behavior, matched firewall policy, destination reputation and security logs before and after exception. Scenario: A medical portal must not expose regulated patient payloads to a middlebox, yet the existing firewall configuration forces decryption for the entire category without privacy review.

Outgoing clients appear upstream with expected translated identities, and return packets reenter a valid tracked session with no address overlap or pool exhaustion. This choice relates to Policy NAT source translation and IP pool selection, not the complementary implementation-and-evidence pair for the case. Implement: Connect FortiGate to the intended LDAP directory over a verified encrypted transport, with correct base DN, bind account and group mappings for firewall authentication. Check: Inspect LDAPS connection and certificate trust, directory bind status, search base, user attributes, group membership and authentication test output. Scenario: An operator disables LDAPS certificate verification after rotating the directory server certificate, risking credentials rather than correcting CA trust.

Inspect authentication rule order, captive portal URL and certificate, user group, browser redirect behavior, session authentication list and logout/timeout timestamps. This choice relates to Captive portal and explicit firewall user authentication, not the complementary implementation-and-evidence pair for the case. Implement: Connect FortiGate to the intended LDAP directory over a verified encrypted transport, with correct base DN, bind account and group mappings for firewall authentication. Check: Inspect LDAPS connection and certificate trust, directory bind status, search base, user attributes, group membership and authentication test output. Scenario: An operator disables LDAPS certificate verification after rotating the directory server certificate, risking credentials rather than correcting CA trust.

Distinguish explicit firewall user authentication from passive identity sources, and diagnose username-to-IP mapping before attributing a FortiGate policy denial to the directory password. This choice relates to Active versus passive FortiGate authentication evidence, not the complementary implementation-and-evidence pair for the case. Implement: Connect FortiGate to the intended LDAP directory over a verified encrypted transport, with correct base DN, bind account and group mappings for firewall authentication. Check: Inspect LDAPS connection and certificate trust, directory bind status, search base, user attributes, group membership and authentication test output. Scenario: An operator disables LDAPS certificate verification after rotating the directory server certificate, risking credentials rather than correcting CA trust.

Blocked DNS queries and permitted browser requests behave in accordance with distinct DNS and web policies, with no assumption that one control inspects all channels. This result would test DNS filtering versus web filtering visibility boundaries but does not demonstrate the desired FortiGate outcome here. Verify instead: Traffic between the intended protected subnet pairs installs valid child security associations and rekeys without repeated interruptions. Scenario: A security engineer shortens Phase 2 SA lifetime on one peer without coordinating rekey behavior, leading recurring outages at predictable intervals.

An incorrectly classified approved site receives a narrow documented exception while disallowed categories continue to be blocked for the intended groups. This result would test FortiGuard category ratings and controlled recategorization but does not demonstrate the desired FortiGate outcome here. Verify instead: Traffic between the intended protected subnet pairs installs valid child security associations and rekeys without repeated interruptions. Scenario: A security engineer shortens Phase 2 SA lifetime on one peer without coordinating rekey behavior, leading recurring outages at predictable intervals.

When one tunnel or underlay fails, protected applications reconnect through a valid alternative within the documented recovery target. This result would test Redundant tunnels, dead peer detection and controlled failover but does not demonstrate the desired FortiGate outcome here. Verify instead: Traffic between the intended protected subnet pairs installs valid child security associations and rekeys without repeated interruptions. Scenario: A security engineer shortens Phase 2 SA lifetime on one peer without coordinating rekey behavior, leading recurring outages at predictable intervals.