Troubleshooting steps for when the IPsec Connectivity Down

Last modified on 15 Apr, 2025. Revision 2
This text is thought to be some general suggestions on what to check if your Ipsec is down. This text is not all that might be needed, but should be considered to be part of the general check in this scenario.
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IPsec Connectivity Down

Change Review

  • Review any recent changes to:
    • VPN profiles
    • Pre-shared keys (PSKs)
    • Certificates
    • Peer settings

Diagnostic Actions

  1. Use the ike -snoop command to inspect IKE negotiations.
  2. Capture VPN-related traffic on the WAN interface (UDP 500/4500).
  3. Check IPsec tunnel status using CLI commands.
  4. Review logs for Phase 1 or Phase 2 negotiation errors.
  5. Confirm availability of the remote peer and verify routing and NAT.

Recovery Milestones

  • Tunnel is up and passes traffic.
  • Negotiation completes successfully; peer is unresponsive.
  • Reverting VPN configuration restores connectivity.

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