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Cisco Bug: CSCum94408 - IOS PKI Public Key caching fails during IKE MM6 Signature verification

Last Modified

Nov 27, 2020

Products (2)

  • Cisco 2600 Series Multiservice Platforms
  • Cisco 2600 Series Multiservice Platforms

Known Affected Releases

15.2(4)M 15.2(4)S

Description (partial)

Intermittently, VPN tunnels may get stuck in the MM_KEY_EXCH state when using certificate authentication and the following error messages are seen in the debugs: 
[Debug crypto isakmp and Debug crypto pki m/t/v/c]

ISAKMP (35845): adding peer's pubkey to cache
ISAKMP:(35845): processing SIG payload. message ID = 0
%CRYPTO-3-IKMP_QUERY_KEY: Querying key pair failed.

This symptom occurs in Cisco IOS configured with the IKEv1, Authentication mode RSA-SIG [Certificates]. PKI Infrastructure is as follows:
Root -> Sub -> ID
- Root and Sub Trustpoint have "revocation-check crl none".
- Sub has "chain-validation continue Root".
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