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adrigonzo avatar image
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adrigonzo asked ·

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

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.

ms-edge
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YuZhou-MSFT avatar image
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YuZhou-MSFT answered ·

Hi @adrigonzo

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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Thank you very much for your reply. This is the info I was looking for!

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Reza-Ameri avatar image
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Reza-Ameri answered ·

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.

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Thank you for your recommendation. We find that some people do still use IE, and as you said, for backward compatibility reasons, as well as, because the option is available in the Internet Options in IE 11, we would like to have the web server available over TLS1.3. If TLS1.3 was not being supported in IE 11, then we would be fine with leaving this endeavour, but I haven't come across information stating that TLS1.3 is not supported in IE 11.

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