istio.io/content/help/faq/security/non-istio-to-istio.md

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If mutual TLS is globally enabled, can non-Istio services access Istio services? 30

Non-Istio services cannot communicate to Istio services unless they can present a valid certificate, which is less likely to happen. This is the expected behavior for mutual TLS. However, you can override the global flag for specific namespaces or services. See task for more details.