of the service:</p><div><aside class="callout warning"><div class=type><svg class="large-icon"><use xlink:href="/v1.2/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=/v1.2/docs/ops/traffic-management/troubleshooting/#503-errors-after-se