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Examine session-pickup configuration, cluster synchronization, monitored-link state, active sessions, NAT state, failover timing and traffic results. This diagnostic is related to HA session-pickup and failover continuity rather than the controlling evidence for this scenario. Examine instead: Inspect FortiGuard connectivity, DNS and time synchronization, registration status, interface DHCP server bindings, lease assignments and excluded addresses. Scenario: A FortiGate replacement was registered under a different support account, so the unit can route internet traffic while its subscription entitlement reports a licensing issue.

Review the current firmware build, supported upgrade path, hardware model, configuration checksum, encrypted backup availability and post-upgrade interface and policy diagnostics. This diagnostic is related to Configuration backups and controlled FortiOS firmware changes rather than the controlling evidence for this scenario. Examine instead: Inspect FortiGuard connectivity, DNS and time synchronization, registration status, interface DHCP server bindings, lease assignments and excluded addresses. Scenario: A FortiGate replacement was registered under a different support account, so the unit can route internet traffic while its subscription entitlement reports a licensing issue.

Check interface administrative-access flags, admin trusted-host entries, role profiles, management service ports, certificate warnings and successful authorized logins. This diagnostic is related to FortiGate administrator access and trusted management surfaces rather than the controlling evidence for this scenario. Examine instead: Inspect FortiGuard connectivity, DNS and time synchronization, registration status, interface DHCP server bindings, lease assignments and excluded addresses. Scenario: A FortiGate replacement was registered under a different support account, so the unit can route internet traffic while its subscription entitlement reports a licensing issue.

Users receive policy access consistent with actual intended directory membership and changes propagate without expanding unrelated privileges. This result would test FSSO group filters and AD membership reconciliation but does not demonstrate the desired FortiGate outcome here. Verify instead: Domain logins populate fresh user-to-IP entries for supported clients and assigned groups drive the intended identity-aware firewall policies. Scenario: An operator installs a DC agent on one domain controller but assumes FSSO sees all branch logins even when they are handled by different unmonitored controllers.

The intended sessions are allowed or blocked according to policy and the required supported threat inspection actually runs on their traffic. This result would test Security profiles and flow versus proxy inspection boundaries but does not demonstrate the desired FortiGate outcome here. Verify instead: Domain logins populate fresh user-to-IP entries for supported clients and assigned groups drive the intended identity-aware firewall policies. Scenario: An operator installs a DC agent on one domain controller but assumes FSSO sees all branch logins even when they are handled by different unmonitored controllers.

Operators can prove why a given session was accepted or denied and can distinguish missing logging from absent traffic. This result would test Implicit denial, policy logging and rule hit interpretation but does not demonstrate the desired FortiGate outcome here. Verify instead: Domain logins populate fresh user-to-IP entries for supported clients and assigned groups drive the intended identity-aware firewall policies. Scenario: An operator installs a DC agent on one domain controller but assumes FSSO sees all branch logins even when they are handled by different unmonitored controllers.

Cloud resources are protected by the approved managed firewall service with visible policy hits and provider-cloud routing appropriate to that deployment model. This choice relates to FortiGate cloud-native firewall CNF service responsibility, not the complementary implementation-and-evidence pair for the case. Implement: Verify the appliance registration and FortiGuard reachability while providing LAN clients with a correctly scoped DHCP address pool, default gateway and DNS configuration. Check: Inspect FortiGuard connectivity, DNS and time synchronization, registration status, interface DHCP server bindings, lease assignments and excluded addresses. Scenario: A FortiGate replacement was registered under a different support account, so the unit can route internet traffic while its subscription entitlement reports a licensing issue.

Capture an encrypted, version-appropriate configuration backup and upgrade FortiOS along the supported path after compatibility checks and a documented recovery plan. This choice relates to Configuration backups and controlled FortiOS firmware changes, not the complementary implementation-and-evidence pair for the case. Implement: Verify the appliance registration and FortiGuard reachability while providing LAN clients with a correctly scoped DHCP address pool, default gateway and DNS configuration. Check: Inspect FortiGuard connectivity, DNS and time synchronization, registration status, interface DHCP server bindings, lease assignments and excluded addresses. Scenario: A FortiGate replacement was registered under a different support account, so the unit can route internet traffic while its subscription entitlement reports a licensing issue.

Inspect user group mapping, SSO state, endpoint registration, FortiClient agent status, posture checks, FortiSASE portal permissions and applied access policy. This choice relates to FortiSASE endpoint onboarding and identity-bound access, not the complementary implementation-and-evidence pair for the case. Implement: Verify the appliance registration and FortiGuard reachability while providing LAN clients with a correctly scoped DHCP address pool, default gateway and DNS configuration. Check: Inspect FortiGuard connectivity, DNS and time synchronization, registration status, interface DHCP server bindings, lease assignments and excluded addresses. Scenario: A FortiGate replacement was registered under a different support account, so the unit can route internet traffic while its subscription entitlement reports a licensing issue.

Map the intended AD security groups through FSSO collector group filters and FortiGate firewall user groups, checking nested membership and current event identity. This addresses FSSO group filters and AD membership reconciliation, but not the principal task of the described flow. An FSSO logon event can be valid while its group mapping is incomplete; FortiGate rules depend on the group data and policy references available at match time. The better fit is: Deploy and validate a supported Fortinet Single Sign-On collector and domain-controller event source, ensuring logon events reach the correct FortiGate connector. Scenario: A collector service loses permissions to read necessary Windows logon events, leaving workstation browsing functional but identity-based policies unable to recognize users.

Maintain precise address objects, FQDN objects, service definitions and supported interface zones so FortiGate rules express intended business segments rather than accidental broad matches. This addresses Address and service objects, interface zones, and policy scoping, but not the principal task of the described flow. A reusable firewall object can expand privileges across multiple policies; zone membership and service port definitions matter independently of the policy name. The better fit is: Deploy and validate a supported Fortinet Single Sign-On collector and domain-controller event source, ensuring logon events reach the correct FortiGate connector. Scenario: A collector service loses permissions to read necessary Windows logon events, leaving workstation browsing functional but identity-based policies unable to recognize users.

Attach supported antivirus, web filter, IPS and application control profiles to the relevant FortiGate firewall policies using a compatible flow-based or proxy-based inspection mode. This addresses Security profiles and flow versus proxy inspection boundaries, but not the principal task of the described flow. Security profiles take effect only when an appropriate policy matches and inspection requirements are met; a profile existing in the GUI does not make it globally active. The better fit is: Deploy and validate a supported Fortinet Single Sign-On collector and domain-controller event source, ensuring logon events reach the correct FortiGate connector. Scenario: A collector service loses permissions to read necessary Windows logon events, leaving workstation browsing functional but identity-based policies unable to recognize users.

Examine user authentication state, configured source user groups, policy schedule, session table, policy ID and log timestamps on the test client. This choice relates to Schedule, authenticated groups and policy-specific change control, not the complementary implementation-and-evidence pair for the case. Implement: Use a supported FortiGate captive portal or identity-aware authentication policy to identify users before applying restricted network access, testing redirection and session lifetime. Check: Inspect authentication rule order, captive portal URL and certificate, user group, browser redirect behavior, session authentication list and logout/timeout timestamps. Scenario: Guest users have unrestricted internet access without the intended captive portal because an earlier open policy matches their subnet first.

A reproducible user authentication event produces the expected group entry and protected session, while stale entries are cleared without broadening firewall rules. This choice relates to FSSO troubleshooting and authentication connector health, not the complementary implementation-and-evidence pair for the case. Implement: Use a supported FortiGate captive portal or identity-aware authentication policy to identify users before applying restricted network access, testing redirection and session lifetime. Check: Inspect authentication rule order, captive portal URL and certificate, user group, browser redirect behavior, session authentication list and logout/timeout timestamps. Scenario: Guest users have unrestricted internet access without the intended captive portal because an earlier open policy matches their subnet first.

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: Use a supported FortiGate captive portal or identity-aware authentication policy to identify users before applying restricted network access, testing redirection and session lifetime. Check: Inspect authentication rule order, captive portal URL and certificate, user group, browser redirect behavior, session authentication list and logout/timeout timestamps. Scenario: Guest users have unrestricted internet access without the intended captive portal because an earlier open policy matches their subnet first.

Inspect certificate subject and SAN, trusted CAs, handshake alerts, supported TLS versions, mTLS client-cert requirements, inspection profile and FortiOS SSL logs. This diagnostic is related to TLS and mutual-certificate handshake fault isolation rather than the controlling evidence for this scenario. Examine instead: Compare inspection sessions, CPU/memory usage, negotiated TLS or QUIC transport, certificate inspection logs, policy profile and any explicit protocol-control rule. Scenario: A browser starts using QUIC for a streaming service, and operators incorrectly expect an HTTP proxy-only inspection rule to show the same application payload events.

Review application log signature name, action, profile override, FortiGuard signature version, client flow, SSL inspection and change history. This diagnostic is related to Application control incident logging and false positive investigation rather than the controlling evidence for this scenario. Examine instead: Compare inspection sessions, CPU/memory usage, negotiated TLS or QUIC transport, certificate inspection logs, policy profile and any explicit protocol-control rule. Scenario: A browser starts using QUIC for a streaming service, and operators incorrectly expect an HTTP proxy-only inspection rule to show the same application payload events.

Inspect exemption target entries, application URL or certificate behavior, matched firewall policy, destination reputation and security logs before and after exception. This diagnostic is related to Targeted SSL inspection exclusions and privacy controls rather than the controlling evidence for this scenario. Examine instead: Compare inspection sessions, CPU/memory usage, negotiated TLS or QUIC transport, certificate inspection logs, policy profile and any explicit protocol-control rule. Scenario: A browser starts using QUIC for a streaming service, and operators incorrectly expect an HTTP proxy-only inspection rule to show the same application payload events.

Approved business applications remain usable while signatures identify and handle prohibited applications with traceable events. This result would test Application control signature matching and required visibility 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 branch IPsec tunnel reports Phase 1 established but no access to a new VLAN because the Phase 2 local selector still includes only the old LAN range.

The expected peer establishes an authenticated IKE security association under approved cryptographic settings without accepting an unintended identity. This result would test FortiGate IPsec Phase 1 IKE negotiation and peer identity 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 branch IPsec tunnel reports Phase 1 established but no access to a new VLAN because the Phase 2 local selector still includes only the old LAN range.

Access succeeds only for the intended group during its authorized time period, while expired sessions and newly unauthorized flows behave predictably. This result would test Schedule, authenticated groups and policy-specific change control 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 branch IPsec tunnel reports Phase 1 established but no access to a new VLAN because the Phase 2 local selector still includes only the old LAN range.

Review DNS policy/profile, DNS transport, query logs, client resolver configuration, DoH/DoT behavior, browser HTTPS requests and matching web-filter outcomes. This diagnostic is related to DNS filtering versus web filtering visibility boundaries rather than the controlling evidence for this scenario. Examine instead: Review policy flow/proxy mode, web filter profile, SSL inspection depth, web request metadata, FortiGuard rating and matching event logs. Scenario: A web browser loads a blocked site over HTTPS, but the security team checks only a generic firewall permit log instead of the associated web filter event.

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: Review policy flow/proxy mode, web filter profile, SSL inspection depth, web request metadata, FortiGuard rating and matching event logs. Scenario: A web browser loads a blocked site over HTTPS, but the security team checks only a generic firewall permit log instead of the associated web filter event.

Inspect AV engine and signature version, FortiGuard reachability, licensing, matched policy, malware verdict, file hash and action logs. This diagnostic is related to FortiGuard antivirus signature freshness and incident response rather than the controlling evidence for this scenario. Examine instead: Review policy flow/proxy mode, web filter profile, SSL inspection depth, web request metadata, FortiGuard rating and matching event logs. Scenario: A web browser loads a blocked site over HTTPS, but the security team checks only a generic firewall permit log instead of the associated web filter event.

Inspect certificate subject and SAN, trusted CAs, handshake alerts, supported TLS versions, mTLS client-cert requirements, inspection profile and FortiOS SSL logs. This choice relates to TLS and mutual-certificate handshake fault isolation, not the complementary implementation-and-evidence pair for the case. Implement: Evaluate supported TLS interception and QUIC/HTTP3 handling against FortiOS model capacity, application requirements and policy visibility instead of assuming every encrypted protocol follows the same inspection path. Check: Compare inspection sessions, CPU/memory usage, negotiated TLS or QUIC transport, certificate inspection logs, policy profile and any explicit protocol-control rule. Scenario: An application fails only when full inspection is enabled and the team blames firewall routing without comparing TLS handshake logs and inspection process load.

Deploy a controlled inspection CA and trusted endpoint certificate chain for full SSL inspection, protecting its private key and ensuring endpoint browsers accept the configured inspection certificate. This choice relates to FortiGate deep-inspection CA trust and certificate deployment, not the complementary implementation-and-evidence pair for the case. Implement: Evaluate supported TLS interception and QUIC/HTTP3 handling against FortiOS model capacity, application requirements and policy visibility instead of assuming every encrypted protocol follows the same inspection path. Check: Compare inspection sessions, CPU/memory usage, negotiated TLS or QUIC transport, certificate inspection logs, policy profile and any explicit protocol-control rule. Scenario: An application fails only when full inspection is enabled and the team blames firewall routing without comparing TLS handshake logs and inspection process load.

The targeted false positive no longer interrupts an approved service, while exploit attempts retain blocking coverage and traceable alerts. This choice relates to IPS signatures, logs and focused exception maintenance, not the complementary implementation-and-evidence pair for the case. Implement: Evaluate supported TLS interception and QUIC/HTTP3 handling against FortiOS model capacity, application requirements and policy visibility instead of assuming every encrypted protocol follows the same inspection path. Check: Compare inspection sessions, CPU/memory usage, negotiated TLS or QUIC transport, certificate inspection logs, policy profile and any explicit protocol-control rule. Scenario: An application fails only when full inspection is enabled and the team blames firewall routing without comparing TLS handshake logs and inspection process load.

Licensed security services update normally and test clients obtain unique LAN leases with the intended gateway and resolver values. This choice relates to FortiGuard connectivity, registration and internal DHCP provisioning, not the complementary implementation-and-evidence pair for the case. Implement: Deploy supported FortiGate-VM interfaces, cloud route tables and security controls so inspected application traffic actually traverses the intended firewall path. Check: Review cloud vNIC and subnet placement, effective cloud routes, source/destination checks where applicable, FortiOS interface addresses, security groups and return-path symmetry. Scenario: An engineer scales FortiGate-VM to an additional NIC but forgets the cloud platform's subnet association and effective route table requirements.

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. This choice relates to FortiGate cloud-native firewall CNF service responsibility, not the complementary implementation-and-evidence pair for the case. Implement: Deploy supported FortiGate-VM interfaces, cloud route tables and security controls so inspected application traffic actually traverses the intended firewall path. Check: Review cloud vNIC and subnet placement, effective cloud routes, source/destination checks where applicable, FortiOS interface addresses, security groups and return-path symmetry. Scenario: An engineer scales FortiGate-VM to an additional NIC but forgets the cloud platform's subnet association and effective route table requirements.

Inspect VM license status, instance capacity, cloud IAM roles, cloud interface attachment, health, FortiOS versions and native cloud traffic policy. This choice relates to Cloud FortiGate licensing and infrastructure ownership boundaries, not the complementary implementation-and-evidence pair for the case. Implement: Deploy supported FortiGate-VM interfaces, cloud route tables and security controls so inspected application traffic actually traverses the intended firewall path. Check: Review cloud vNIC and subnet placement, effective cloud routes, source/destination checks where applicable, FortiOS interface addresses, security groups and return-path symmetry. Scenario: An engineer scales FortiGate-VM to an additional NIC but forgets the cloud platform's subnet association and effective route table requirements.

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: Build a FortiGate intrusion prevention sensor using supported signature filters, action overrides and protected-application context, then attach it to the correct policy. Scenario: A security architect enables every IPS signature on a sensitive OT segment without testing false-positive and latency impacts on legacy industrial protocols.

Apply narrowly scoped, auditable SSL-inspection exclusions for supported certificate-pinned or regulated applications without disabling inspection for every other destination. This addresses Targeted SSL inspection exclusions and privacy controls, but not the principal task of the described flow. Broad category-level SSL exemptions can create large visibility gaps; an exception should be limited to the actual affected flow and justified by policy. The better fit is: Build a FortiGate intrusion prevention sensor using supported signature filters, action overrides and protected-application context, then attach it to the correct policy. Scenario: A security architect enables every IPS signature on a sensitive OT segment without testing false-positive and latency impacts on legacy industrial protocols.

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: Build a FortiGate intrusion prevention sensor using supported signature filters, action overrides and protected-application context, then attach it to the correct policy. Scenario: A security architect enables every IPS signature on a sensitive OT segment without testing false-positive and latency impacts on legacy industrial protocols.