s/configuration/traffic-management/protocol-selection/>Protocol Selection</a> for
more details.</p></li></ul><h2 id=ports-used-by-istio>Ports used by Istio</h2><p>The following ports and protocols are used by the Istio sidecar proxy (Envoy).</p><div><aside class="callout warning"><div class=type><svg class="large-icon"><use xlink:href="/v1.10/img/icons.svg#callout-warning"/></svg></div><div class=content>To avoid port conflicts with sidecars, applications should not use any of the ports used by Envoy.</div>