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Michael Pfister
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IE 11 with TLS 1.3 on Windows 10 1909

When enabling TLS 1.3 (experimental) in IE 11 the browser test https://browserleaks.com/ssl still shows:

Protocol Support

TLS 1.3×  Disabled
TLS 1.2✔Enabled

What is missing here?
Other browsers (Edge Chromium, Firefox) work fine,,,


Windows 10Windows OSWeb Browsers

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Michael Pfister

8/22/2022 - Mon
ASKER CERTIFIED SOLUTION
Daniel Pineault

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Michael Pfister

ASKER
Thanks Daniel!

https://www.microsoft.com/security/blog/2020/08/20/taking-transport-layer-security-tls-to-the-next-level-with-tls-1-3/

On 1909 its probably due TLS 1.3 support isn't builtin.

It should be available on 20H2. But here you have to enable it first:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.3\Client]
"DisabledByDefault"=dword:00000000
"Enabled"=dword:00000001

But this breaks many pages on IE11... i.e. https://www.experts-exchange.com/ 
From the 3 test sites only https://clienttest.ssllabs.com:8443/ssltest/viewMyClient.html is still working and is showing correct results.
Other pages show "Connection Reset"  (INET_E_DOWNLOAD_FAILURE)

Status  "too experimental for me"
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