TLS1.3 is it supported?

Question

Hi everyone,
Is TLS1.3 supported in IIS on Windows Server 2016?

I'm unable to find any documentation where it says if it is or not.

Answer 1

Hi,

TLS 1.3 is not yet available yet for any version of Windows Server, keep track of the link below, once support will be made available the link will be updated.

Protocols in TLS/SSL (Schannel SSP)
https://learn.microsoft.com/en-us/windows/win32/secauthn/protocols-in-tls-ssl--schannel-ssp-

----------

(If the reply was helpful please don't forget to accept as answer, thank you)

Best regards,
Leon

Answer 2

Hello,
IIS rely on Schannel. However, no windows server version has supported TLS 1.3 in schannel.
https://en.wikipedia.org/wiki/Transport_Layer_Security#TLS_1.3
Based on my search, TLS 1.3 is still in Draft and there is no expected release date as of now.
Best Regards,
Carl

Answer 3

The link posted above as something to rely on is 404.

Initial implementation of TLS 1.3 (unfit for production use) is already available from Windows 10 Version 1903, however it seems to be broken (WinHttpSendRequest returns error 0x80072f8f with TLS 1.3, works fine with TLS 1.2).

The lack of progress and the lack of clear communication from Microsoft on when TLS 1.3 is going to be fully supported in SCHANNEL which is used by a lot of system and 3rd party libraries (winhttp and curl to name just a few), browsers, development platforms such as .Net Framework, and IIS web server itself is really appaling.

Answer 4

TLS1.3 is the latest TLS technology and it is only supported in Windows11 and Windows server 2022 and onwards.

Windows OS	TLS 1.0 Client	TLS 1.0 Server	TLS 1.1 Client	TLS 1.1 Server	TLS 1.2 Client	TLS 1.2 Server	TLS 1.3 Client	TLS 1.3 Server
Windows 8/Windows Server 2012	Enabled	Enabled	Enabled	Enabled	Enabled	Enabled	Not supported	Not supported
Windows 8.1/Windows Server 2012 R2	Enabled	Enabled	Enabled	Enabled	Enabled	Enabled	Not supported	Not supported
Windows 10, version 1607/Windows Server 2016 Standard	Enabled	Enabled	Enabled	Enabled	Enabled	Enabled	Not supported	Not supported
Windows 10, version 1809//Windows Server 2019	Enabled	Enabled	Enabled	Enabled	Enabled	Enabled	Not supported	Not supported
Windows Server 2022	Enabled	Enabled	Enabled	Enabled	Enabled	Enabled	Enabled	Enabled
Windows 11	Enabled	Enabled	Enabled	Enabled	Enabled	Enabled	Enabled	Enabled

 

More informations in the article below-

https://learn.microsoft.com/en-us/windows/win32/secauthn/protocols-in-tls-ssl--schannel-ssp-