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VPN tunnel between Security Gateways fails for no apparent reason, and kernel debug shows '...dropped by vpn_encrypt_chain Reason: no reason' Technical Level
Symptoms
  • VPN tunnel between Security Gateways fails for no apparent reason.

  • IKE debug (per sk180488) shows a failure on Phase 1 (Main Mode) - Packet 1 is sent to the VPN peer, and VPN peer sends a reply packet. IKE negotiation does not proceed.

  • Kernel debug ('fw ctl debug -m fw + drop') shows that the reply packet from VPN peer is '...dropped by vpn_encrypt_chain Reason: no reason'.

  • Configuration in SmartDashboard has been verified for IKE Phase 1 and IKE Phase 2.

  • Either Traditional VPN, or Simplified VPN mode is used.

  • Issue occurs in cluster environment.
Cause

The VPND daemon fails to pass the packet to ClusterXL layer.


Solution
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