Document the compatability issue of auto mTLS and exlucdeInboundPort. (#8917)

* Document the compatability issue of auto mTLS and exlucdeInboundPort.

* retitle

* Update content/en/faq/security/automtls-exlucde-port.md

Co-authored-by: Sven Mawson <sven@google.com>

* Update content/en/faq/security/automtls-exlucde-port.md

Co-authored-by: Sven Mawson <sven@google.com>

* more suggestions applied

* comments, rename.

Co-authored-by: Sven Mawson <sven@google.com>
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---
title: Does Auto mutual TLS exclude ports set using "excludeInboundPorts" annotation?
weight: 80
---
No. When `traffic.sidecar.istio.io/excludeInboundPorts` is used on server workloads, Istio still
configures the client Envoy to send mutual TLS by default. To change that, you need to configure
a Destination Rule with mutual TLS mode set to `DISABLE` to have clients send plain text to those
ports.