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The routing table references the configured tunnel interface and authorized protected traffic follows that tunnel path. This would verify a separate corrective action: Select the FortiGate-supported route-based IPsec tunnel interface design when explicit interface routing is required. That separate change addresses: A team configures a policy-based VPN but expects an automatically created tunnel interface for independent routing rules. It does not validate the current Pinecrest Hotels issue: A disconnected IPsec peer remains reported as usable for too long because dead-peer detection does not match the service recovery requirement. The relevant acceptance evidence is: After a controlled peer failure, the tunnel status changes within the defined detection window and eligible backup routing engages.

The gateway reports an established Phase 2 security association and a permitted test subnet can exchange packets. This would verify a separate corrective action: Align the supported Phase 2 proposals and relevant perfect forward secrecy settings for the authorized protected networks. That separate change addresses: An IPsec tunnel is established at IKE Phase 1 but protected traffic fails because Phase 2 encryption or integrity proposals differ. It does not validate the current Pinecrest Hotels issue: A disconnected IPsec peer remains reported as usable for too long because dead-peer detection does not match the service recovery requirement. The relevant acceptance evidence is: After a controlled peer failure, the tunnel status changes within the defined detection window and eligible backup routing engages.

A permitted named user authenticates and receives its scoped policy while a separate identity lacking approval is denied. This would verify a separate corrective action: Require supported per-user or certificate-based IPsec authentication in addition to appropriate gateway peer validation. That separate change addresses: A user-based remote-access IPsec deployment allows an unidentified device after shared preshared-secret use, despite a requirement for individual authentication. It does not validate the current Pinecrest Hotels issue: A disconnected IPsec peer remains reported as usable for too long because dead-peer detection does not match the service recovery requirement. The relevant acceptance evidence is: After a controlled peer failure, the tunnel status changes within the defined detection window and eligible backup routing engages.

Configure supported IPv6 protected prefixes, routes and firewall policies for the intended site-to-site design. This applies to a DIFFERENT FortiGate situation: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. It is not a targeted solution for the current Oakridge Public Services requirement: A disconnected IPsec peer remains reported as usable for too long because dead-peer detection does not match the service recovery requirement. The appropriate result to verify here is: After a controlled peer failure, the tunnel status changes within the defined detection window and eligible backup routing engages.

Configure the supported FortiGate remote-access IPsec authentication and address-assignment method with the relevant user group and access policy. This applies to a DIFFERENT FortiGate situation: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. It is not a targeted solution for the current Oakridge Public Services requirement: A disconnected IPsec peer remains reported as usable for too long because dead-peer detection does not match the service recovery requirement. The appropriate result to verify here is: After a controlled peer failure, the tunnel status changes within the defined detection window and eligible backup routing engages.

Evaluate a meshed or partially meshed IPsec topology with explicit security associations and approved intersite routes. This applies to a DIFFERENT FortiGate situation: Three FortiGate sites require direct access to each other for backup traffic, but the deployed hub-only IPsec architecture causes unnecessary transit dependence. It is not a targeted solution for the current Oakridge Public Services requirement: A disconnected IPsec peer remains reported as usable for too long because dead-peer detection does not match the service recovery requirement. The appropriate result to verify here is: After a controlled peer failure, the tunnel status changes within the defined detection window and eligible backup routing engages.

A planned primary node failover restores protected site traffic within the measured approved recovery time without duplicate active tunnels. This would verify a separate corrective action: Document and implement supported FGCP and IPsec failover behavior and coordinate peer reconnection or SA recovery with recovery objectives. That separate change addresses: The active FortiGate node fails in an HA pair and site-to-site VPN sessions do not recover within the expected time because tunnel and HA roles were not tested. It does not validate the current Oakridge Public Services issue: A disconnected IPsec peer remains reported as usable for too long because dead-peer detection does not match the service recovery requirement. The relevant acceptance evidence is: After a controlled peer failure, the tunnel status changes within the defined detection window and eligible backup routing engages.

An authorized IPsec test session negotiates over the supported TCP transport and its protected data reaches the intended remote subnet. This would verify a separate corrective action: Use the supported IKE-over-TCP transport configuration where available and verify peer compatibility and approved transport policy. That separate change addresses: An IPsec tunnel is required to operate across a network that permits TCP 443 but blocks traditional IKE UDP traffic on FortiOS versions supporting IKE over TCP. It does not validate the current Oakridge Public Services issue: A disconnected IPsec peer remains reported as usable for too long because dead-peer detection does not match the service recovery requirement. The relevant acceptance evidence is: After a controlled peer failure, the tunnel status changes within the defined detection window and eligible backup routing engages.

An approved FortiClient user authenticates and reaches the designated protected service without relying on unrelated site-to-site or unsupported tunnel assumptions. This would verify a separate corrective action: Choose a supported FortiOS 7.6.0 remote-access IPsec profile with user authentication and documented tunnel interface access policy. That separate change addresses: A remote-user VPN deployment relies on an unverified legacy tunnel setting while the new FortiGate access design requires a supportable user-authenticated IPsec VPN. It does not validate the current Oakridge Public Services issue: A disconnected IPsec peer remains reported as usable for too long because dead-peer detection does not match the service recovery requirement. The relevant acceptance evidence is: After a controlled peer failure, the tunnel status changes within the defined detection window and eligible backup routing engages.

Choose a supported FortiOS 7.6.0 remote-access IPsec profile with user authentication and documented tunnel interface access policy. This applies to a DIFFERENT FortiGate situation: A remote-user VPN deployment relies on an unverified legacy tunnel setting while the new FortiGate access design requires a supportable user-authenticated IPsec VPN. It is not a targeted solution for the current Granite SaaS requirement: A FortiGate tunnel repeatedly fails on first use because its Phase 2 security association is never brought up until user traffic arrives. The appropriate result to verify here is: The approved tunnel shows an established security association before the first application request and passes the initial test packet.

Review and narrow the wizard-generated route and firewall policy objects to the approved partner prefixes and application ports. This applies to a DIFFERENT FortiGate situation: A FortiGate IPsec wizard created broad default policies for a partner VPN and the partner can reach sensitive networks outside the signed agreement. It is not a targeted solution for the current Granite SaaS requirement: A FortiGate tunnel repeatedly fails on first use because its Phase 2 security association is never brought up until user traffic arrives. The appropriate result to verify here is: The approved tunnel shows an established security association before the first application request and passes the initial test packet.

Remove unintended SNAT on the VPN policy or use the explicitly documented translated-address design if overlap requires it. This applies to a DIFFERENT FortiGate situation: The FortiGate remote-site IPsec policy unintentionally applies internet source NAT to intersite traffic and breaks remote server identity checks. It is not a targeted solution for the current Granite SaaS requirement: A FortiGate tunnel repeatedly fails on first use because its Phase 2 security association is never brought up until user traffic arrives. The appropriate result to verify here is: The approved tunnel shows an established security association before the first application request and passes the initial test packet.

An approved intersite application connects under the specific logged policy while unrelated networks remain blocked. This would verify a separate corrective action: Create a narrowly scoped firewall policy between the correct LAN and IPsec tunnel interfaces with required addresses and services. That separate change addresses: A branch-to-headquarters IPsec tunnel connects but the FortiGate has no forward firewall rule permitting the protected VLANs. It does not validate the current Granite SaaS issue: A FortiGate tunnel repeatedly fails on first use because its Phase 2 security association is never brought up until user traffic arrives. The relevant acceptance evidence is: The approved tunnel shows an established security association before the first application request and passes the initial test packet.

A controlled IPv6 intersite session traverses the permitted VPN path while unrelated IPv6 destinations remain denied. This would verify a separate corrective action: Configure supported IPv6 protected prefixes, routes and firewall policies for the intended site-to-site design. That separate change addresses: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. It does not validate the current Granite SaaS issue: A FortiGate tunnel repeatedly fails on first use because its Phase 2 security association is never brought up until user traffic arrives. The relevant acceptance evidence is: The approved tunnel shows an established security association before the first application request and passes the initial test packet.

A controlled IKE negotiation succeeds and both gateways report a healthy Phase 1 security association. This would verify a separate corrective action: Align IKE version and supported encryption, integrity and key exchange proposals on both authorized IPsec peers. That separate change addresses: Two FortiGate peers fail to establish an IPsec tunnel because one uses incompatible IKE versions and Phase 1 proposals. It does not validate the current Granite SaaS issue: A FortiGate tunnel repeatedly fails on first use because its Phase 2 security association is never brought up until user traffic arrives. The relevant acceptance evidence is: The approved tunnel shows an established security association before the first application request and passes the initial test packet.

Plan unique prefixes or an explicitly scoped translated VPN addressing architecture before advertising overlapping networks. This applies to a DIFFERENT FortiGate situation: Two subsidiaries use overlapping RFC1918 addresses and a straightforward route-based IPsec tunnel sends packets to ambiguous destinations. It is not a targeted solution for the current Northgate Telecom requirement: A FortiGate tunnel repeatedly fails on first use because its Phase 2 security association is never brought up until user traffic arrives. The appropriate result to verify here is: The approved tunnel shows an established security association before the first application request and passes the initial test packet.

Configure supported IPsec NAT traversal and verify that the relevant IKE and UDP 4500 paths are reachable through approved upstream rules. This applies to a DIFFERENT FortiGate situation: A FortiGate IPsec connection is behind an upstream NAT and peers fail to carry ESP traffic using the expected transport. It is not a targeted solution for the current Northgate Telecom requirement: A FortiGate tunnel repeatedly fails on first use because its Phase 2 security association is never brought up until user traffic arrives. The appropriate result to verify here is: The approved tunnel shows an established security association before the first application request and passes the initial test packet.

Correlate specific tunnel interface routes, Phase 2 selectors, firewall policy IDs and encrypted packet counters for a controlled test flow. This applies to a DIFFERENT FortiGate situation: An IPsec troubleshooting report lists only green tunnel status without showing whether the application packets use the correct security association. It is not a targeted solution for the current Northgate Telecom requirement: A FortiGate tunnel repeatedly fails on first use because its Phase 2 security association is never brought up until user traffic arrives. The appropriate result to verify here is: The approved tunnel shows an established security association before the first application request and passes the initial test packet.

A controlled test identifies the exact missing forwarding prerequisite rather than treating an established IKE SA as proof of end-to-end service. This would verify a separate corrective action: Check tunnel SA state together with selectors, routes, firewall policies and local or remote session counters. That separate change addresses: An IPsec tunnel interface appears active but the engineer tries to debug application failures only by looking at Phase 1 negotiation logs. It does not validate the current Northgate Telecom issue: A FortiGate tunnel repeatedly fails on first use because its Phase 2 security association is never brought up until user traffic arrives. The relevant acceptance evidence is: The approved tunnel shows an established security association before the first application request and passes the initial test packet.

Branches reach the permitted headquarters services and forbidden direct branch-to-branch paths remain unavailable. This would verify a separate corrective action: Use an appropriate hub-and-spoke IPsec layout with selective branch routes and firewall policies for the required traffic pattern. That separate change addresses: A FortiGate hub must connect numerous branch sites and engineers build a full mesh without a documented requirement for branch-to-branch traffic. It does not validate the current Northgate Telecom issue: A FortiGate tunnel repeatedly fails on first use because its Phase 2 security association is never brought up until user traffic arrives. The relevant acceptance evidence is: The approved tunnel shows an established security association before the first application request and passes the initial test packet.

A representative large-file test completes without fragmentation black-holes or sustained retransmission stalls over the VPN. This would verify a separate corrective action: Investigate effective tunnel MTU and supported TCP MSS adjustments or PMTU discovery along the entire route. That separate change addresses: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. It does not validate the current Northgate Telecom issue: A FortiGate tunnel repeatedly fails on first use because its Phase 2 security association is never brought up until user traffic arrives. The relevant acceptance evidence is: The approved tunnel shows an established security association before the first application request and passes the initial test packet.

Add the specific static or supported dynamic route toward the IPsec tunnel interface and preserve routing segmentation. This applies to a DIFFERENT FortiGate situation: An IPsec security association is up yet the FortiGate routing table has no path from the local VLAN to the remote protected prefix. It is not a targeted solution for the current Lakeside Research requirement: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. The appropriate result to verify here is: The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window.

Review and narrow the wizard-generated route and firewall policy objects to the approved partner prefixes and application ports. This applies to a DIFFERENT FortiGate situation: A FortiGate IPsec wizard created broad default policies for a partner VPN and the partner can reach sensitive networks outside the signed agreement. It is not a targeted solution for the current Lakeside Research requirement: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. The appropriate result to verify here is: The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window.

Use an appropriate hub-and-spoke IPsec layout with selective branch routes and firewall policies for the required traffic pattern. This applies to a DIFFERENT FortiGate situation: A FortiGate hub must connect numerous branch sites and engineers build a full mesh without a documented requirement for branch-to-branch traffic. It is not a targeted solution for the current Lakeside Research requirement: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. The appropriate result to verify here is: The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window.

An authorized FortiClient test user obtains the intended remote-access session and reaches only the permitted internal service. This would verify a separate corrective action: Configure the supported FortiGate remote-access IPsec authentication and address-assignment method with the relevant user group and access policy. That separate change addresses: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. It does not validate the current Lakeside Research issue: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. The relevant acceptance evidence is: The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window.

An approved intersite application connects under the specific logged policy while unrelated networks remain blocked. This would verify a separate corrective action: Create a narrowly scoped firewall policy between the correct LAN and IPsec tunnel interfaces with required addresses and services. That separate change addresses: A branch-to-headquarters IPsec tunnel connects but the FortiGate has no forward firewall rule permitting the protected VLANs. It does not validate the current Lakeside Research issue: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. The relevant acceptance evidence is: The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window.

A test flow from the new subnet matches an approved selector and traverses the established IPsec security association. This would verify a separate corrective action: Update the allowed Phase 2 selectors or supported route-based selector model consistently at both ends of the tunnel. That separate change addresses: Two route-based IPsec peers are online but never pass application traffic because the Phase 2 traffic selectors exclude the new branch subnet. It does not validate the current Lakeside Research issue: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. The relevant acceptance evidence is: The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window.

Check tunnel SA state together with selectors, routes, firewall policies and local or remote session counters. This applies to a DIFFERENT FortiGate situation: An IPsec tunnel interface appears active but the engineer tries to debug application failures only by looking at Phase 1 negotiation logs. It is not a targeted solution for the current Timberline Foods requirement: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. The appropriate result to verify here is: The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window.

Configure supported IPsec NAT traversal and verify that the relevant IKE and UDP 4500 paths are reachable through approved upstream rules. This applies to a DIFFERENT FortiGate situation: A FortiGate IPsec connection is behind an upstream NAT and peers fail to carry ESP traffic using the expected transport. It is not a targeted solution for the current Timberline Foods requirement: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. The appropriate result to verify here is: The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window.

Configure the supported FortiGate remote-access IPsec authentication and address-assignment method with the relevant user group and access policy. This applies to a DIFFERENT FortiGate situation: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. It is not a targeted solution for the current Timberline Foods requirement: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. The appropriate result to verify here is: The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window.

After a controlled branch-address change, the authorized peer re-establishes the VPN without opening access to arbitrary unknown peers. This would verify a separate corrective action: Use supported dynamic-peer, DNS or dialup IPsec configuration appropriate to the changing branch endpoint identity. That separate change addresses: A FortiGate branch behind an ISP receives a changing public IP and the head office IPsec peer remains configured with an obsolete fixed gateway address. It does not validate the current Timberline Foods issue: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. The relevant acceptance evidence is: The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window.

Branches reach the permitted headquarters services and forbidden direct branch-to-branch paths remain unavailable. This would verify a separate corrective action: Use an appropriate hub-and-spoke IPsec layout with selective branch routes and firewall policies for the required traffic pattern. That separate change addresses: A FortiGate hub must connect numerous branch sites and engineers build a full mesh without a documented requirement for branch-to-branch traffic. It does not validate the current Timberline Foods issue: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. The relevant acceptance evidence is: The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window.

The remote server responds to the actual approved source subnet and the FortiGate records a complete bidirectional tunnel session. This would verify a separate corrective action: Configure bidirectional tunnel and LAN return routing or an explicitly approved NAT design for the protected networks. That separate change addresses: A remote branch has no inbound service response after an IPsec connection because its internal LAN lacks a route back to the original client prefix. It does not validate the current Timberline Foods issue: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. The relevant acceptance evidence is: The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window.