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After a network security administrator configures site-to-site IPsec VPN peer, they receive this error message: 1d00h: %CRYPTO-6-IKMP_MODE_FAILURE: Processing of Main Mode failed with peer at 150.150.150.1. What is the solution to this problem?
Correct Answer: A
The error message "%CRYPTO-6-IKMP_MODE_FAILURE: Processing of Main Mode failed with peer at 150.150.150.1" indicates that IKE Phase 1 negotiation (Main Mode) failed. The most common cause of this failure is a mismatch in ISAKMP (Internet Security Association and Key Management Protocol) policies between the VPN peers. For IKE Phase 1 to succeed, both VPN devices must have matching ISAKMP policies, including: Encryption method (e.g., AES, 3DES) Hashing algorithm (e.g., SHA-256, SHA-1) Authentication method (e.g., pre-shared key or RSA signature) Diffie-Hellman group (e.g., DH Group 14, 19, etc.) Lifetime settings