Occasional Visitor



I tried to enable TLS 1.3 on Windows Server 2019(IIS 10),

for some reason this doesn't work well.


I changed the registry settings to change this


[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.3\Server]






I'm wondering if it's possible to leave it enabled and get it to work.


With kind Regards

Mukul Waghmare

They backported TLS 1.3 to build 17763?
i have seen it backported only on 18362 & 19041



According to my information there is no down level support of TLS 1.3 e.g Server 2019, Server 2016


Officially supported in WIndows Server 2022




The above registry settings are correct, enable for client and server.

Open a firefox page and click a site certificate. TLS 1.3 will be listed under security.

You should also enable HTTP/2 protocol for IIS (and your own browsing) - blazing fast:

Open your registry editor and navigate to:
Make sure you have the following entries:
EnableHttp2Cleartext REG_DWORD 1
EnableHttp2Tls REG_DWORD 1

HTTP/3 supported in Server 2022. Still checking if it will work in 2019 it uses UDP (burst) 443 with TLS 1.3

Kind regards