The Tanium Server certificate must be signed by a DoD certificate authority (CA).

The Tanium Server has the option to use a "self-signed" certificate or a trusted CA signed certificate for SSL connections. During evaluations of Tanium in lab settings, customers often conclude that a "self-signed" certificate is an acceptable risk. However, in production environments it is critical that an SSL certificate signed by a trusted CA be used on the Tanium Server in lieu of an untrusted and insecure "self-signed" certificate.