ut warning"><div class=type><svg class="large-icon"><use xlink:href="/v1.1/img/icons.svg#callout-warning"/></svg></div><div class=content>If you installed/configured Istio with mutual TLS Authentication enabled, you must add a TLS traffic policy <code>mode: ISTIO_MUTUAL</code> to the <code>DestinationRule</code> before applying it. Otherwise requests will generate 503 errors as described <a href=/v1.1/help/ops/traffic-management/troubleshooting/#503-errors-after-setting-destination-rule>here</a>.</div></asi