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After a planned primary ISP outage, a new authorized intersite connection uses the backup IPsec tunnel and returns successfully. This would verify a separate corrective action: Configure supported redundant IPsec tunnels and route preferences across independent WAN paths with matching partner settings. That separate change addresses: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. It does not validate the current Maplewood Schools issue: Two subsidiaries use overlapping RFC1918 addresses and a straightforward route-based IPsec tunnel sends packets to ambiguous destinations. The relevant acceptance evidence is: A test from each site reaches the correct intended remote service through an unambiguous tunnel route without leaking other subnets.

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 Maplewood Schools issue: Two subsidiaries use overlapping RFC1918 addresses and a straightforward route-based IPsec tunnel sends packets to ambiguous destinations. The relevant acceptance evidence is: A test from each site reaches the correct intended remote service through an unambiguous tunnel route without leaking other subnets.

The report traces an authorized test packet from its original subnet into the expected SA and back from the peer with matching logs. This would verify a separate corrective action: Correlate specific tunnel interface routes, Phase 2 selectors, firewall policy IDs and encrypted packet counters for a controlled test flow. That separate change addresses: An IPsec troubleshooting report lists only green tunnel status without showing whether the application packets use the correct security association. It does not validate the current Maplewood Schools issue: Two subsidiaries use overlapping RFC1918 addresses and a straightforward route-based IPsec tunnel sends packets to ambiguous destinations. The relevant acceptance evidence is: A test from each site reaches the correct intended remote service through an unambiguous tunnel route without leaking other subnets.

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 Cedarfield Hospitality requirement: 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. The appropriate result to verify here is: A planned primary node failover restores protected site traffic within the measured approved recovery time without duplicate active tunnels.

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 Cedarfield Hospitality requirement: 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. The appropriate result to verify here is: A planned primary node failover restores protected site traffic within the measured approved recovery time without duplicate active tunnels.

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 Cedarfield Hospitality requirement: 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. The appropriate result to verify here is: A planned primary node failover restores protected site traffic within the measured approved recovery time without duplicate active tunnels.

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 Cedarfield Hospitality issue: 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. The relevant acceptance evidence is: A planned primary node failover restores protected site traffic within the measured approved recovery time without duplicate active tunnels.

Controlled traffic between the designated site pair uses the intended direct tunnel and the other connections retain their documented policy. This would verify a separate corrective action: Evaluate a meshed or partially meshed IPsec topology with explicit security associations and approved intersite routes. That separate change addresses: Three FortiGate sites require direct access to each other for backup traffic, but the deployed hub-only IPsec architecture causes unnecessary transit dependence. It does not validate the current Cedarfield Hospitality issue: 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. The relevant acceptance evidence is: A planned primary node failover restores protected site traffic within the measured approved recovery time without duplicate active tunnels.

The security association status reports both phases active and the permitted application session traverses the tunnel. This would verify a separate corrective action: Inspect both IKE and IPsec security associations and correct the specific Phase 2 proposal or traffic-selector mismatch. That separate change addresses: An administrator declares an IPsec site-to-site tunnel working solely because Phase 1 is up, while its Phase 2 SA is absent. It does not validate the current Cedarfield Hospitality issue: 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. The relevant acceptance evidence is: A planned primary node failover restores protected site traffic within the measured approved recovery time without duplicate active tunnels.

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 Meadowbrook Finance requirement: 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. The appropriate result to verify here is: A planned primary node failover restores protected site traffic within the measured approved recovery time without duplicate active tunnels.

Align the supported Phase 2 proposals and relevant perfect forward secrecy settings for the authorized protected networks. This applies to a DIFFERENT FortiGate situation: An IPsec tunnel is established at IKE Phase 1 but protected traffic fails because Phase 2 encryption or integrity proposals differ. It is not a targeted solution for the current Meadowbrook Finance requirement: 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. The appropriate result to verify here is: A planned primary node failover restores protected site traffic within the measured approved recovery time without duplicate active tunnels.

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 Meadowbrook Finance requirement: 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. The appropriate result to verify here is: A planned primary node failover restores protected site traffic within the measured approved recovery time without duplicate active tunnels.

A controlled bidirectional test increments encrypted packet counters in both directions on the intended tunnel. This would verify a separate corrective action: Compare tunnel interface counters, selectors, routing and remote peer status before changing the local allow policy. That separate change addresses: A branch firewall shows growing IPsec outbound packet counters but zero inbound encrypted packets, suggesting the remote path is not returning traffic. It does not validate the current Meadowbrook Finance issue: 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. The relevant acceptance evidence is: A planned primary node failover restores protected site traffic within the measured approved recovery time without duplicate active tunnels.

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 Meadowbrook Finance issue: 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. The relevant acceptance evidence is: A planned primary node failover restores protected site traffic within the measured approved recovery time without duplicate active tunnels.

A remote application observes the expected original branch source address and an authorized tunnel session remains bidirectional. This would verify a separate corrective action: Remove unintended SNAT on the VPN policy or use the explicitly documented translated-address design if overlap requires it. That separate change addresses: The FortiGate remote-site IPsec policy unintentionally applies internet source NAT to intersite traffic and breaks remote server identity checks. It does not validate the current Meadowbrook Finance issue: 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. The relevant acceptance evidence is: A planned primary node failover restores protected site traffic within the measured approved recovery time without duplicate active tunnels.

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 Harborline Logistics requirement: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. The appropriate result to verify here is: After a planned primary ISP outage, a new authorized intersite connection uses the backup IPsec tunnel and returns successfully.

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 Harborline Logistics requirement: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. The appropriate result to verify here is: After a planned primary ISP outage, a new authorized intersite connection uses the backup IPsec tunnel and returns successfully.

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 Harborline Logistics requirement: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. The appropriate result to verify here is: After a planned primary ISP outage, a new authorized intersite connection uses the backup IPsec tunnel and returns successfully.

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 Harborline Logistics issue: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. The relevant acceptance evidence is: After a planned primary ISP outage, a new authorized intersite connection uses the backup IPsec tunnel and returns successfully.

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 Harborline Logistics issue: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. The relevant acceptance evidence is: After a planned primary ISP outage, a new authorized intersite connection uses the backup IPsec tunnel and returns successfully.

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 Harborline Logistics issue: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. The relevant acceptance evidence is: After a planned primary ISP outage, a new authorized intersite connection uses the backup IPsec tunnel and returns successfully.

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 Highland Education requirement: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. The appropriate result to verify here is: After a planned primary ISP outage, a new authorized intersite connection uses the backup IPsec tunnel and returns successfully.

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 Highland Education requirement: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. The appropriate result to verify here is: After a planned primary ISP outage, a new authorized intersite connection uses the backup IPsec tunnel and returns successfully.

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 Highland Education requirement: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. The appropriate result to verify here is: After a planned primary ISP outage, a new authorized intersite connection uses the backup IPsec tunnel and returns successfully.

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 Highland Education issue: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. The relevant acceptance evidence is: After a planned primary ISP outage, a new authorized intersite connection uses the backup IPsec tunnel and returns successfully.

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 Highland Education issue: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. The relevant acceptance evidence is: After a planned primary ISP outage, a new authorized intersite connection uses the backup IPsec tunnel and returns successfully.

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 Highland Education issue: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. The relevant acceptance evidence is: After a planned primary ISP outage, a new authorized intersite connection uses the backup IPsec tunnel and returns successfully.

Enable an appropriate supported auto-negotiate or keepalive behavior for the documented always-on IPsec requirement. This applies to a DIFFERENT FortiGate situation: A FortiGate tunnel repeatedly fails on first use because its Phase 2 security association is never brought up until user traffic arrives. It is not a targeted solution for the current Eastshore Energy 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 Eastshore Energy 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.

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 Eastshore Energy 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.

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.