What are the IE 11 requirements for using TLS1.3 only browsing.

Adriana Gonzalez 21 Reputation points
2021-02-22T12:08:26.683+00:00

When enabling only TLS1.3 option in IE 11 (version 1909, OS build 18363.1316) we are not able to connect a TLS1.3 only enabled web server. Looking at the network traffic, there is no TLS1.3 Client Hello being sent out from IE 11.
Is there information somewhere on how IE 11 supports this option?

We have tried 5 other browsers, all of which connect fine. We are trying to determine if there is some other prerequisite on IE 11 that we are not meeting.

Microsoft Edge
Microsoft Edge
A Microsoft cross-platform web browser that provides privacy, learning, and accessibility tools.
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  1. Yu Zhou-MSFT 12,036 Reputation points Microsoft Vendor
    2021-02-23T09:26:52.913+00:00

    Hi @Adriana Gonzalez

    IE 11 doesn't support TLS1.3. You can check caniuse and Microsoft official site.

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    Yu Zhou

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  1. Reza-Ameri 16,826 Reputation points
    2021-02-22T17:28:41.93+00:00

    Internet Explorer is no longer supporting new standards and we recommend you to switch to Microsoft Edge and only use Internet Explorer for backward compatibility.
    You may manage TLS settings from Advanced tab in the Internet options.