Firefox 'ssl_error_bad_cert_alert' on DoD site

windowsmacoslinux

Symptoms

Firefox throws ssl_error_bad_cert_alert when attempting CAC authentication.

Likely cause

Firefox cannot present the right CAC certificate, usually because the PKCS#11 module is not loaded or the cert is wrong.

Fix

1. Confirm the PKCS#11 module is loaded under Preferences > Privacy & Security > Security Devices. 2. In Preferences > Privacy & Security > Certificates, set 'Ask me every time'. 3. Retry and pick the Authentication cert (not EMAIL).

Sourced from militarycac.com. Rewritten for clarity.

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