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A security engineer deploys a certificate from a commercial CA to the RADIUS server for use with the EAP-TLS wireless network. Authentication is failing, so the engineer examines the certificate's properties: Issuer: (A commercial CA) Valid from: (yesterday's date) Valid to: (one year from yesterday's date) Subject: CN=smithco.com Public key: RSA (2048 bits) Enhanced key usage: Client authentication (1.3.6.1.5.5.7.3.2) Key usage: Digital signature, key encipherment (a0) Which of the following is the MOST likely cause of the failure?