m the namespace <code>foo</code> will not be rejected. The mTLS-only field <code>namespaces</code> will be
compared to an empty value when mTLS is not used, resulting in a policy that does not reject the <strong>plain text request</strong>
even if the source namespace is <code>foo</code>.</p><h2 id=solution>Solution</h2><p>To solve this problem, it&rsquo;s recommended to always <a href=/v1.10/docs/tasks/security/authentication/authn-policy/#enable-mutual-tls-per-namespace-or-workload>enable mTLS with STRICT