During a configuration recovery exercise, engineers discover that a site-to-site VPN certificate is renewed but the opposite FortiGate does not trust the new chain. What specific failure risk follows if the underlying fault remains?
Certificate-authenticated tunnels fail when trust or certificate identity validation is broken. Certificate-based IKE authentication relies on chain validation, identity matching and acceptable certificate validity. The described exposure follows from leaving the certificate-based VPN peer trust dependency unresolved.
It would be a concern if VPN identity mismatch behind NAT were misconfigured. Here Certificate-based IKE authentication relies on chain validation, identity matching and acceptable certificate validity. The selected alternative does not follow from the observed fault.
This describes a separate IPsec MTU and MSS fragmentation failure. IPsec overhead reduces effective payload size and requires correct MTU or MSS handling on constrained paths. It does not identify the most direct consequence of leaving certificate-based VPN peer trust unresolved.
That risk is associated with IKE Phase 1 proposal mismatch rather than the failing certificate-based VPN peer trust dependency. IKE Phase 1 establishes the protected control channel and needs mutually supported cryptographic negotiation. The present scenario establishes a different causal exposure.
A post-incident review at a public library system identifies that an IPsec tunnel using certificates fails after its issuing CA was removed from the peer's trust store. The same control is still uncorrected. Which exposure should the risk register record?
Certificate-authenticated tunnels fail when trust or certificate identity validation is broken. Certificate-based IKE authentication relies on chain validation, identity matching and acceptable certificate validity. The described exposure follows from leaving the certificate-based VPN peer trust dependency unresolved.
That risk is associated with DPD peer liveness rather than the failing certificate-based VPN peer trust dependency. DPD detects IKE peer loss when a tunnel stops responding to liveness exchanges. The present scenario establishes a different causal exposure.
It would be a concern if wrong remote gateway identity were misconfigured. Here Certificate-based IKE authentication relies on chain validation, identity matching and acceptable certificate validity. The selected alternative does not follow from the observed fault.
This describes a separate IKE version mismatch failure. Peers must agree on the IKE protocol and associated negotiation capabilities. It does not identify the most direct consequence of leaving certificate-based VPN peer trust unresolved.
At a cloud operations team running FortiOS 7.6, an IPsec child SA forms initially but drops at every rekey after peers were configured with incompatible settings. Which configuration or investigative change most directly resolves this issue?
Align supported Phase 2 proposals, PFS settings and key-rekey behavior across the peers. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. This corrects the FortiGate behavior described by the specific tunnel phase2 rekey mismatch fault.
This correction targets PFS group mismatch. PFS contributes fresh key material to child-SA negotiation and requires peer agreement. It does not repair the stated tunnel phase2 rekey mismatch condition: an IPsec child SA forms initially but drops at every rekey after peers were configured with incompatible settings.
The proposed setting concerns IPsec inter-site firewall policies, not the actual source of failure. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. It would leave the cited symptom unresolved.
This correction targets IPsec tunnel diagnostics and logging. Successful VPN service requires IKE control-plane establishment and verified encrypted bidirectional data-plane traffic. It does not repair the stated tunnel phase2 rekey mismatch condition: an IPsec child SA forms initially but drops at every rekey after peers were configured with incompatible settings.
During a weekend failover rehearsal, a branch tunnel survives startup but recurrent renegotiation disrupts traffic around Phase 2 renewal. What should the FortiGate administrator change to meet the stated requirement?
Align supported Phase 2 proposals, PFS settings and key-rekey behavior across the peers. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. This corrects the FortiGate behavior described by the specific tunnel phase2 rekey mismatch fault.
Changing this could help when the fault is IPsec inter-site firewall policies, because iPsec negotiation and FortiGate firewall authorization operate at separate layers. Here the evidence instead identifies tunnel phase2 rekey mismatch; the recommended correction addresses that dependency.
The proposed setting concerns certificate-based VPN peer trust, not the actual source of failure. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. It would leave the cited symptom unresolved.
Changing this could help when the fault is DPD peer liveness, because dPD detects IKE peer loss when a tunnel stops responding to liveness exchanges. Here the evidence instead identifies tunnel phase2 rekey mismatch; the recommended correction addresses that dependency.
A retail logistics company discovers a FortiGate control gap during a configuration recovery exercise: an IPsec child SA forms initially but drops at every rekey after peers were configured with incompatible settings; additionally, a branch tunnel survives startup but recurrent renegotiation disrupts traffic around Phase 2 renewal. Which targeted correction should the team implement?
Align supported Phase 2 proposals, PFS settings and key-rekey behavior across the peers. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. This corrects the FortiGate behavior described by the specific tunnel phase2 rekey mismatch fault.
The proposed setting concerns IPsec tunnel diagnostics and logging, not the actual source of failure. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. It would leave the cited symptom unresolved.
This correction targets NAT traversal UDP 4500. IPsec NAT-T encapsulates ESP in UDP for compatible paths that cross NAT. It does not repair the stated tunnel phase2 rekey mismatch condition: an IPsec child SA forms initially but drops at every rekey after peers were configured with incompatible settings.
Changing this could help when the fault is partial mesh branch IPsec design, because vPN topology should match explicit site-to-site reachability and redundancy requirements rather than defaulting to full mesh. Here the evidence instead identifies tunnel phase2 rekey mismatch; the recommended correction addresses that dependency.
The e-commerce platform team is verifying its fix for an incident where an IPsec child SA forms initially but drops at every rekey after peers were configured with incompatible settings. Which specific observation most convincingly demonstrates the required FortiGate behavior?
Multiple controlled rekey cycles complete with updated child SAs and uninterrupted test application traffic. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. This is directly observable evidence for the tunnel phase2 rekey mismatch requirement, rather than a generic appliance-health indicator.
This verifies a different control: certificate-based VPN peer trust. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. The stated incident requires evidence of its own packet, identity or policy behavior.
A result about IPsec tunnel diagnostics and logging can be true while the tunnel phase2 rekey mismatch defect persists. Successful VPN service requires IKE control-plane establishment and verified encrypted bidirectional data-plane traffic. It does not validate the tested dependency.
That observation is a useful test for Phase 2 selector mismatch, but not decisive proof of tunnel phase2 rekey mismatch. Phase 2 selectors and proposals define which traffic the negotiated IPsec data SA protects. The recorded acceptance check must demonstrate the actual requirement.
After an incident-response triage, administrators correct a problem where a branch tunnel survives startup but recurrent renegotiation disrupts traffic around Phase 2 renewal. Which test result should their acceptance record contain?
Multiple controlled rekey cycles complete with updated child SAs and uninterrupted test application traffic. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. This is directly observable evidence for the tunnel phase2 rekey mismatch requirement, rather than a generic appliance-health indicator.
This verifies a different control: NAT traversal UDP 4500. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. The stated incident requires evidence of its own packet, identity or policy behavior.
That observation is a useful test for Phase 2 selector mismatch, but not decisive proof of tunnel phase2 rekey mismatch. Phase 2 selectors and proposals define which traffic the negotiated IPsec data SA protects. The recorded acceptance check must demonstrate the actual requirement.
This verifies a different control: IKE Phase 1 proposal mismatch. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. The stated incident requires evidence of its own packet, identity or policy behavior.
An auditor reviewing a distributed engineering campus deployment finds that an IPsec child SA forms initially but drops at every rekey after peers were configured with incompatible settings. The team claims this is resolved; which concrete evidence would substantiate that claim?
Multiple controlled rekey cycles complete with updated child SAs and uninterrupted test application traffic. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. This is directly observable evidence for the tunnel phase2 rekey mismatch requirement, rather than a generic appliance-health indicator.
A result about preshared key disagreement can be true while the tunnel phase2 rekey mismatch defect persists. A preshared key authenticates the expected IKE peer and must match at both ends. It does not validate the tested dependency.
That observation is a useful test for NAT traversal UDP 4500, but not decisive proof of tunnel phase2 rekey mismatch. IPsec NAT-T encapsulates ESP in UDP for compatible paths that cross NAT. The recorded acceptance check must demonstrate the actual requirement.
A result about IKE version mismatch can be true while the tunnel phase2 rekey mismatch defect persists. Peers must agree on the IKE protocol and associated negotiation capabilities. It does not validate the tested dependency.
If a financial services branch leaves the following FortiGate issue unresolved—an IPsec child SA forms initially but drops at every rekey after peers were configured with incompatible settings—what is the most direct operational or security consequence?
Mismatched Phase 2 security parameters may cause periodic traffic interruption at SA renewal. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. The described exposure follows from leaving the tunnel phase2 rekey mismatch dependency unresolved.
That risk is associated with certificate-based VPN peer trust rather than the failing tunnel phase2 rekey mismatch dependency. Certificate-based IKE authentication relies on chain validation, identity matching and acceptable certificate validity. The present scenario establishes a different causal exposure.
It would be a concern if PFS group mismatch were misconfigured. Here Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. The selected alternative does not follow from the observed fault.
This describes a separate IKE version mismatch failure. Peers must agree on the IKE protocol and associated negotiation capabilities. It does not identify the most direct consequence of leaving tunnel phase2 rekey mismatch unresolved.
During a segmentation review, engineers discover that a branch tunnel survives startup but recurrent renegotiation disrupts traffic around Phase 2 renewal. What specific failure risk follows if the underlying fault remains?
Mismatched Phase 2 security parameters may cause periodic traffic interruption at SA renewal. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. The described exposure follows from leaving the tunnel phase2 rekey mismatch dependency unresolved.
This describes a separate IPsec tunnel diagnostics and logging failure. Successful VPN service requires IKE control-plane establishment and verified encrypted bidirectional data-plane traffic. It does not identify the most direct consequence of leaving tunnel phase2 rekey mismatch unresolved.
That risk is associated with Phase 2 selector mismatch rather than the failing tunnel phase2 rekey mismatch dependency. Phase 2 selectors and proposals define which traffic the negotiated IPsec data SA protects. The present scenario establishes a different causal exposure.
It would be a concern if redundant tunnel preferences were misconfigured. Here Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. The selected alternative does not follow from the observed fault.
A post-incident review at a regional manufacturing group identifies that an IPsec child SA forms initially but drops at every rekey after peers were configured with incompatible settings. The same control is still uncorrected. Which exposure should the risk register record?
Mismatched Phase 2 security parameters may cause periodic traffic interruption at SA renewal. Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. The described exposure follows from leaving the tunnel phase2 rekey mismatch dependency unresolved.
This describes a separate certificate-based VPN peer trust failure. Certificate-based IKE authentication relies on chain validation, identity matching and acceptable certificate validity. It does not identify the most direct consequence of leaving tunnel phase2 rekey mismatch unresolved.
It would be a concern if VPN identity mismatch behind NAT were misconfigured. Here Phase 2 rekeys must negotiate compatible protection parameters while existing SAs expire. The selected alternative does not follow from the observed fault.
This describes a separate IPsec tunnel diagnostics and logging failure. Successful VPN service requires IKE control-plane establishment and verified encrypted bidirectional data-plane traffic. It does not identify the most direct consequence of leaving tunnel phase2 rekey mismatch unresolved.
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