Ensure that the IPSec parameters (encryption, authentication, key exchange) match on both ends.
Parameters include:
Encryption Algorithms (e.g., AES, 3DES)
Hash Algorithms (e.g., SHA-1, SHA-256)
Authentication Methods (e.g., Pre-shared Key, Certificates)
Diffie-Hellman Groups
IPSec Policies: Check the security policies or ACLs (Access Control Lists) to ensure they allow the desired traffic.
IKE (Internet Key Exchange) Phases: Verify that the IKE Phase 1 and Phase 2 parameters match.
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