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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 Keystone BioLabs issue: A branch firewall shows growing IPsec outbound packet counters but zero inbound encrypted packets, suggesting the remote path is not returning traffic. The relevant acceptance evidence is: A controlled bidirectional test increments encrypted packet counters in both directions on the intended tunnel.

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 Keystone BioLabs issue: A branch firewall shows growing IPsec outbound packet counters but zero inbound encrypted packets, suggesting the remote path is not returning traffic. The relevant acceptance evidence is: A controlled bidirectional test increments encrypted packet counters in both directions on the intended tunnel.

The partner reaches its contracted test service but access attempts to a protected unrelated subnet are denied and logged. This would verify a separate corrective action: Review and narrow the wizard-generated route and firewall policy objects to the approved partner prefixes and application ports. That separate change addresses: A FortiGate IPsec wizard created broad default policies for a partner VPN and the partner can reach sensitive networks outside the signed agreement. It does not validate the current Keystone BioLabs issue: A branch firewall shows growing IPsec outbound packet counters but zero inbound encrypted packets, suggesting the remote path is not returning traffic. The relevant acceptance evidence is: A controlled bidirectional test increments encrypted packet counters in both directions on the intended tunnel.

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 Harborview Insurance requirement: A branch firewall shows growing IPsec outbound packet counters but zero inbound encrypted packets, suggesting the remote path is not returning traffic. The appropriate result to verify here is: A controlled bidirectional test increments encrypted packet counters in both directions on the intended tunnel.

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 Harborview Insurance requirement: A branch firewall shows growing IPsec outbound packet counters but zero inbound encrypted packets, suggesting the remote path is not returning traffic. The appropriate result to verify here is: A controlled bidirectional test increments encrypted packet counters in both directions on the intended tunnel.

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 Harborview Insurance requirement: A branch firewall shows growing IPsec outbound packet counters but zero inbound encrypted packets, suggesting the remote path is not returning traffic. The appropriate result to verify here is: A controlled bidirectional test increments encrypted packet counters in both directions on the intended tunnel.

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 Harborview Insurance issue: A branch firewall shows growing IPsec outbound packet counters but zero inbound encrypted packets, suggesting the remote path is not returning traffic. The relevant acceptance evidence is: A controlled bidirectional test increments encrypted packet counters in both directions on the intended tunnel.

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 Harborview Insurance issue: A branch firewall shows growing IPsec outbound packet counters but zero inbound encrypted packets, suggesting the remote path is not returning traffic. The relevant acceptance evidence is: A controlled bidirectional test increments encrypted packet counters in both directions on the intended tunnel.

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 Harborview Insurance issue: A branch firewall shows growing IPsec outbound packet counters but zero inbound encrypted packets, suggesting the remote path is not returning traffic. The relevant acceptance evidence is: A controlled bidirectional test increments encrypted packet counters in both directions on the intended tunnel.

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 Brookside Manufacturing requirement: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. The appropriate result to verify here is: A representative large-file test completes without fragmentation black-holes or sustained retransmission stalls over the VPN.

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 Brookside Manufacturing requirement: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. The appropriate result to verify here is: A representative large-file test completes without fragmentation black-holes or sustained retransmission stalls over the VPN.

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 Brookside Manufacturing requirement: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. The appropriate result to verify here is: A representative large-file test completes without fragmentation black-holes or sustained retransmission stalls over the VPN.

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 Brookside Manufacturing issue: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. The relevant acceptance evidence is: A representative large-file test completes without fragmentation black-holes or sustained retransmission stalls over the VPN.

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 Brookside Manufacturing issue: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. The relevant acceptance evidence is: A representative large-file test completes without fragmentation black-holes or sustained retransmission stalls over the VPN.

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 Brookside Manufacturing issue: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. The relevant acceptance evidence is: A representative large-file test completes without fragmentation black-holes or sustained retransmission stalls over the VPN.

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 Riverton Utilities requirement: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. The appropriate result to verify here is: A representative large-file test completes without fragmentation black-holes or sustained retransmission stalls over the VPN.

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 Riverton Utilities requirement: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. The appropriate result to verify here is: A representative large-file test completes without fragmentation black-holes or sustained retransmission stalls over the VPN.

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 Riverton Utilities requirement: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. The appropriate result to verify here is: A representative large-file test completes without fragmentation black-holes or sustained retransmission stalls over the VPN.

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 Riverton Utilities issue: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. The relevant acceptance evidence is: A representative large-file test completes without fragmentation black-holes or sustained retransmission stalls over the VPN.

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 Riverton Utilities issue: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. The relevant acceptance evidence is: A representative large-file test completes without fragmentation black-holes or sustained retransmission stalls over the VPN.

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 Riverton Utilities issue: Small packets traverse a FortiGate IPsec VPN but large TCP data transfers stall because encapsulation lowers the path MTU. The relevant acceptance evidence is: A representative large-file test completes without fragmentation black-holes or sustained retransmission stalls over the VPN.

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 Alpine Healthcare requirement: Two subsidiaries use overlapping RFC1918 addresses and a straightforward route-based IPsec tunnel sends packets to ambiguous destinations. The appropriate result to verify here is: A test from each site reaches the correct intended remote service through an unambiguous tunnel route without leaking other subnets.

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 Alpine Healthcare requirement: Two subsidiaries use overlapping RFC1918 addresses and a straightforward route-based IPsec tunnel sends packets to ambiguous destinations. The appropriate result to verify here is: A test from each site reaches the correct intended remote service through an unambiguous tunnel route without leaking other subnets.

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 Alpine Healthcare requirement: Two subsidiaries use overlapping RFC1918 addresses and a straightforward route-based IPsec tunnel sends packets to ambiguous destinations. The appropriate result to verify here is: A test from each site reaches the correct intended remote service through an unambiguous tunnel route without leaking other subnets.

The partner reaches its contracted test service but access attempts to a protected unrelated subnet are denied and logged. This would verify a separate corrective action: Review and narrow the wizard-generated route and firewall policy objects to the approved partner prefixes and application ports. That separate change addresses: A FortiGate IPsec wizard created broad default policies for a partner VPN and the partner can reach sensitive networks outside the signed agreement. It does not validate the current Alpine Healthcare 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.

A controlled reconnection creates an attributable IKE negotiation log with the peer identity and reason for any failure. This would verify a separate corrective action: Enable appropriate VPN event logging and scoped diagnostics on both authorized peers before changing cryptographic proposals. That separate change addresses: A FortiGate IPsec connection intermittently fails but its VPN event logs are disabled and no one can correlate negotiation attempts. It does not validate the current Alpine Healthcare 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 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 Alpine Healthcare 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.

Configure supported redundant IPsec tunnels and route preferences across independent WAN paths with matching partner settings. This applies to a DIFFERENT FortiGate situation: A company provisions only one IPsec path to its main office although the connectivity requirement explicitly includes diverse ISP failover. It is not a targeted solution for the current Maplewood Schools requirement: Two subsidiaries use overlapping RFC1918 addresses and a straightforward route-based IPsec tunnel sends packets to ambiguous destinations. The appropriate result to verify here is: A test from each site reaches the correct intended remote service through an unambiguous tunnel route without leaking other subnets.

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

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

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.