unication packet', system error: 0</code>.</p><p>This can be fixed by ensuring <code>STRICT</code> or <code>DISABLE</code> mode is used, or that all clients are configured
to send mTLS. See <a href=/v1.20/docs/ops/deployment/requirements/#server-first-protocols>server first protocols</a> for more information.</p></div><h5 id=does-istio-support-authorization class=question>Does Istio support authorization?</h5><div class=answer><p>Yes. Istio provides authorization features for both HTTP and plain TCP service