TLS 1.3 security protocol

Question

Does anyone know if it is possible to enable/install the TLS 1.3 security protocol on Windows Server 2012 R2 version of IIS 8.5?

Answer 1

No. TLS 1.3 isn't supported by the older OSes. The earliest OS that supports TLS 1.3 that I'm aware of is Server 2022. No version of Windows prior to that supports the newest protocol. If you need TLS 1.3 support then you'll need to ensure you're running at least Server 2022. There is no way to add it to the older versions.

You can get the formal support list from here.

Answer 2

Hello

Enabling TLS 1.3 on Windows Server 2012 R2 with IIS 8.5 is not possible. TLS 1.3 is supported starting from Windows Server 2022 and Windows 11. For older versions like Windows Server 2012 R2, you can only enable up to TLS 1.2.