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The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window. This would verify a separate corrective action: Review IKE and IPsec SA lifetimes and align supported rekey parameters on both FortiGate and partner endpoints. That separate change addresses: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. It does not validate the current Eastshore Energy issue: The FortiGate remote-site IPsec policy unintentionally applies internet source NAT to intersite traffic and breaks remote server identity checks. The relevant acceptance evidence is: A remote application observes the expected original branch source address and an authorized tunnel session remains bidirectional.

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 Eastshore Energy issue: The FortiGate remote-site IPsec policy unintentionally applies internet source NAT to intersite traffic and breaks remote server identity checks. The relevant acceptance evidence is: A remote application observes the expected original branch source address and an authorized tunnel session remains bidirectional.

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 Eastshore Energy issue: The FortiGate remote-site IPsec policy unintentionally applies internet source NAT to intersite traffic and breaks remote server identity checks. The relevant acceptance evidence is: A remote application observes the expected original branch source address and an authorized tunnel session remains bidirectional.

Compare tunnel interface counters, selectors, routing and remote peer status before changing the local allow policy. This applies to a DIFFERENT FortiGate situation: A branch firewall shows growing IPsec outbound packet counters but zero inbound encrypted packets, suggesting the remote path is not returning traffic. It is not a targeted solution for the current Westhaven Retail requirement: The FortiGate remote-site IPsec policy unintentionally applies internet source NAT to intersite traffic and breaks remote server identity checks. The appropriate result to verify here is: A remote application observes the expected original branch source address and an authorized tunnel session remains bidirectional.

Inspect both IKE and IPsec security associations and correct the specific Phase 2 proposal or traffic-selector mismatch. This applies to a DIFFERENT FortiGate situation: An administrator declares an IPsec site-to-site tunnel working solely because Phase 1 is up, while its Phase 2 SA is absent. It is not a targeted solution for the current Westhaven Retail requirement: The FortiGate remote-site IPsec policy unintentionally applies internet source NAT to intersite traffic and breaks remote server identity checks. The appropriate result to verify here is: A remote application observes the expected original branch source address and an authorized tunnel session remains bidirectional.

Configure supported dead peer detection timing and tunnel monitoring appropriate to the WAN stability and failover target. This applies to a DIFFERENT FortiGate situation: A disconnected IPsec peer remains reported as usable for too long because dead-peer detection does not match the service recovery requirement. It is not a targeted solution for the current Westhaven Retail requirement: The FortiGate remote-site IPsec policy unintentionally applies internet source NAT to intersite traffic and breaks remote server identity checks. The appropriate result to verify here is: A remote application observes the expected original branch source address and an authorized tunnel session remains bidirectional.

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 Westhaven Retail issue: The FortiGate remote-site IPsec policy unintentionally applies internet source NAT to intersite traffic and breaks remote server identity checks. The relevant acceptance evidence is: A remote application observes the expected original branch source address and an authorized tunnel session remains bidirectional.

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 Westhaven Retail issue: The FortiGate remote-site IPsec policy unintentionally applies internet source NAT to intersite traffic and breaks remote server identity checks. The relevant acceptance evidence is: A remote application observes the expected original branch source address and an authorized tunnel session remains bidirectional.

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 Westhaven Retail issue: The FortiGate remote-site IPsec policy unintentionally applies internet source NAT to intersite traffic and breaks remote server identity checks. The relevant acceptance evidence is: A remote application observes the expected original branch source address and an authorized tunnel session remains bidirectional.

Update the allowed Phase 2 selectors or supported route-based selector model consistently at both ends of the tunnel. This applies to a DIFFERENT FortiGate situation: Two route-based IPsec peers are online but never pass application traffic because the Phase 2 traffic selectors exclude the new branch subnet. It is not a targeted solution for the current Oakridge Public Services requirement: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. The appropriate result to verify here is: A controlled IPv6 intersite session traverses the permitted VPN path while unrelated IPv6 destinations remain denied.

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: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. The appropriate result to verify here is: A controlled IPv6 intersite session traverses the permitted VPN path while unrelated IPv6 destinations remain denied.

Investigate effective tunnel MTU and supported TCP MSS adjustments or PMTU discovery along the entire route. This applies to a DIFFERENT FortiGate situation: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. It is not a targeted solution for the current Oakridge Public Services requirement: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. The appropriate result to verify here is: A controlled IPv6 intersite session traverses the permitted VPN path while unrelated IPv6 destinations remain denied.

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 Oakridge Public Services issue: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. The relevant acceptance evidence is: A controlled IPv6 intersite session traverses the permitted VPN path while unrelated IPv6 destinations remain denied.

The tunnel rekeys during a controlled observation without repeated negotiation failures or loss outside the approved window. This would verify a separate corrective action: Review IKE and IPsec SA lifetimes and align supported rekey parameters on both FortiGate and partner endpoints. That separate change addresses: A long-lived IPsec tunnel drops intermittently during rekey because the peers use incompatible lifetime or rekey settings. It does not validate the current Oakridge Public Services issue: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. The relevant acceptance evidence is: A controlled IPv6 intersite session traverses the permitted VPN path while unrelated IPv6 destinations remain denied.

The tunnel negotiates through the NAT device and protected test packets exchange successfully under the expected encapsulation. This would verify a separate corrective action: Configure supported IPsec NAT traversal and verify that the relevant IKE and UDP 4500 paths are reachable through approved upstream rules. That separate change addresses: A FortiGate IPsec connection is behind an upstream NAT and peers fail to carry ESP traffic using the expected transport. It does not validate the current Oakridge Public Services issue: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. The relevant acceptance evidence is: A controlled IPv6 intersite session traverses the permitted VPN path while unrelated IPv6 destinations remain denied.

Update the allowed Phase 2 selectors or supported route-based selector model consistently at both ends of the tunnel. This applies to a DIFFERENT FortiGate situation: Two route-based IPsec peers are online but never pass application traffic because the Phase 2 traffic selectors exclude the new branch subnet. It is not a targeted solution for the current Pinecrest Hotels requirement: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. The appropriate result to verify here is: A controlled IPv6 intersite session traverses the permitted VPN path while unrelated IPv6 destinations remain denied.

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 Pinecrest Hotels requirement: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. The appropriate result to verify here is: A controlled IPv6 intersite session traverses the permitted VPN path while unrelated IPv6 destinations remain denied.

Use supported dynamic-peer, DNS or dialup IPsec configuration appropriate to the changing branch endpoint identity. This applies to a DIFFERENT FortiGate situation: 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 is not a targeted solution for the current Pinecrest Hotels requirement: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. The appropriate result to verify here is: A controlled IPv6 intersite session traverses the permitted VPN path while unrelated IPv6 destinations remain denied.

The tunnel negotiates through the NAT device and protected test packets exchange successfully under the expected encapsulation. This would verify a separate corrective action: Configure supported IPsec NAT traversal and verify that the relevant IKE and UDP 4500 paths are reachable through approved upstream rules. That separate change addresses: A FortiGate IPsec connection is behind an upstream NAT and peers fail to carry ESP traffic using the expected transport. It does not validate the current Pinecrest Hotels issue: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. The relevant acceptance evidence is: A controlled IPv6 intersite session traverses the permitted VPN path while unrelated IPv6 destinations remain denied.

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 Pinecrest Hotels issue: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. The relevant acceptance evidence is: A controlled IPv6 intersite session traverses the permitted VPN path while unrelated IPv6 destinations remain denied.

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: An IPsec deployment has separate IPv4 and IPv6 service requirements but its tunnel selectors and routing cover only IPv4 prefixes. The relevant acceptance evidence is: A controlled IPv6 intersite session traverses the permitted VPN path while unrelated IPv6 destinations remain denied.

Select the FortiGate-supported route-based IPsec tunnel interface design when explicit interface routing is required. This applies to a DIFFERENT FortiGate situation: A team configures a policy-based VPN but expects an automatically created tunnel interface for independent routing rules. It is not a targeted solution for the current Northgate Telecom requirement: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. The appropriate result to verify here is: An authorized FortiClient test user obtains the intended remote-access session and reaches only the permitted internal service.

Create a narrowly scoped firewall policy between the correct LAN and IPsec tunnel interfaces with required addresses and services. This applies to a DIFFERENT FortiGate situation: A branch-to-headquarters IPsec tunnel connects but the FortiGate has no forward firewall rule permitting the protected VLANs. It is not a targeted solution for the current Northgate Telecom requirement: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. The appropriate result to verify here is: An authorized FortiClient test user obtains the intended remote-access session and reaches only the permitted internal service.

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: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. The appropriate result to verify here is: An authorized FortiClient test user obtains the intended remote-access session and reaches only the permitted internal service.

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: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. The relevant acceptance evidence is: An authorized FortiClient test user obtains the intended remote-access session and reaches only the permitted internal service.

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 Northgate Telecom issue: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. The relevant acceptance evidence is: An authorized FortiClient test user obtains the intended remote-access session and reaches only the permitted internal service.

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 Northgate Telecom issue: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. The relevant acceptance evidence is: An authorized FortiClient test user obtains the intended remote-access session and reaches only the permitted internal service.

Compare tunnel interface counters, selectors, routing and remote peer status before changing the local allow policy. This applies to a DIFFERENT FortiGate situation: A branch firewall shows growing IPsec outbound packet counters but zero inbound encrypted packets, suggesting the remote path is not returning traffic. It is not a targeted solution for the current Granite SaaS requirement: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. The appropriate result to verify here is: An authorized FortiClient test user obtains the intended remote-access session and reaches only the permitted internal service.

Use the supported IKE-over-TCP transport configuration where available and verify peer compatibility and approved transport policy. This applies to a DIFFERENT FortiGate situation: 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 is not a targeted solution for the current Granite SaaS requirement: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. The appropriate result to verify here is: An authorized FortiClient test user obtains the intended remote-access session and reaches only the permitted internal service.

Install a securely generated matching preshared secret through the approved tunnel management process on both gateways. This applies to a DIFFERENT FortiGate situation: An IPsec site-to-site tunnel fails IKE authentication because the FortiGate peers use different preshared secrets. It is not a targeted solution for the current Granite SaaS requirement: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. The appropriate result to verify here is: An authorized FortiClient test user obtains the intended remote-access session and reaches only the permitted internal service.

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 Granite SaaS issue: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. The relevant acceptance evidence is: An authorized FortiClient test user obtains the intended remote-access session and reaches only the permitted internal service.

The tunnel negotiates through the NAT device and protected test packets exchange successfully under the expected encapsulation. This would verify a separate corrective action: Configure supported IPsec NAT traversal and verify that the relevant IKE and UDP 4500 paths are reachable through approved upstream rules. That separate change addresses: A FortiGate IPsec connection is behind an upstream NAT and peers fail to carry ESP traffic using the expected transport. It does not validate the current Granite SaaS issue: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. The relevant acceptance evidence is: An authorized FortiClient test user obtains the intended remote-access session and reaches only the permitted internal service.

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 Granite SaaS issue: Remote employee devices must use a managed FortiClient IPsec remote-access connection, but the gateway has only a site-to-site peer policy. The relevant acceptance evidence is: An authorized FortiClient test user obtains the intended remote-access session and reaches only the permitted internal service.