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[ScreenOS] Rejected an initial Phase 1 packet from an unrecognized peer gateway

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Article ID: KB6235 KB Last Updated: 27 Dec 2019Version: 5.0
Summary:

Rejected an initial Phase 1 packet from an unrecognized peer gateway

Symptoms:

Environment:

  • IPSec VPN

Symptoms & Errors:

  • In the Netscreen event log, what can cause the IKE Phase 1 "Unrecognized Peer Gateway" error message?
  • Rejected an initial Phase 1 packet from an unrecognized peer gateway
  • Initiating IKE Phase 1 ... message not received
Solution:

If the ScreenOS log event shows this message:

Rejected an initial Phase 1 packet from an unrecognized peer gateway

There are several possible causes for this:

  1. Peer gateway address misconfigured when configuring the IKE Gateway.

    Resolution: Correct the gateway address on the remote side

  2. Peer ID misconfigured.'  The if remote end has a dynamic IP address, then the peer ID is misconfigured.'  Basically, the peer id that was received in the phase 1 negotiation does not match the peer id in the ike configuration.

    Resolution: Modify the peer id on the local device and the local id on the remote device so they are the same

  3. Wrong outgoing interface defined in the IKE Phase 1 gateway.

    Resolution: Modify the outgoing interface in phase 1 so it matches the interface that the IKE negotiation will be going out of

Modification History:
2019-12-27: Minor, non-technical update.
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