GitHub - p120ph37/darwin-racoon-cisco-cert-fix: A patched version of the Mac OSX built-in VPN client to allow it to work with Cisco certificate-based authentication.

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Use the File->Import Items menu to import the CA certificate and your PKCS12 cert+key file. These should show up under the "Certificates" category. Double-click on the CA certificate, expand the "Trust" entry and set "When using this certificate:" to "Always Trust"