On the ASA, use:
The primary solution is to generate a new key pair and request a new certificate from your CA.
show crypto ca certificates
The "EE key is too small" error on Cisco ASA can be a frustrating issue to troubleshoot, but by understanding the root cause and implementing the solutions outlined in this article, you should be able to resolve the issue. Remember to follow best practices to prevent similar issues in the future and ensure the security and integrity of your network configuration.
" on a Cisco ASA indicates that the End-Entity (EE) certificate—the identity certificate assigned to an interface or service—uses a public key (typically RSA) that is smaller than the minimum size required by the system's security policy. Cisco Community Root Cause Key Size Mismatch: cisco asa certificate validation failed. ee key is too small
If the ASA itself is using a weak certificate (e.g., for terminating VPNs or ASDM HTTPS):
Alternatively, capture the IKE handshake using Wireshark and inspect the CERT payload. The Certificate field will show the public key length. On the ASA, use: The primary solution is
Keywords: Cisco ASA, certificate validation failed, EE key is too small, 1024-bit RSA, IKEv2, AnyConnect VPN, PKI, crypto hardening