Protocols in TLS/SSL (Schannel SSP)
The Schannel SSP implements versions of the TLS, DTLS and SSL protocols. Different Windows versions support different protocol versions.
TLS protocol version support
The following table displays the Microsoft Schannel Provider support of TLS protocol versions.
Important
Starting with Windows 11 Insider Preview releases in 2024, TLS versions 1.0 and 1.1 will be disabled by default. This change applies to both server and client devices but won't impact in-market operating system versions. For more information, see TLS 1.0 and TLS 1.1 deprecation in Windows.
Note
TLS 1.3 is supported starting in Windows 11 and Windows Server 2022. Enabling TLS 1.3 on earlier versions of Windows is not a safe system configuration.
Tip
You may need to scroll horizontally or select Expand table to view all columns in the table.
| 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 Vista/Windows Server 2008 | Enabled | Enabled | Not supported | Not supported | Not supported | Not supported | Not supported | Not supported |
| Windows Server 2008 with Service Pack 2 (SP2) | Enabled | Enabled | Disabled | Disabled | Disabled | Disabled | Not supported | Not supported |
| Windows 7/Windows Server 2008 R2 | Enabled | Enabled | Disabled | Disabled | Disabled | Disabled | Not supported | Not supported |
| 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 1507 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Not supported | Not supported |
| Windows 10, version 1511 | 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 1703 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Not supported | Not supported |
| Windows 10, version 1709 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Not supported | Not supported |
| Windows 10, version 1803 | 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 10, version 1903 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Not supported | Not supported |
| Windows 10, version 1909 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Not supported | Not supported |
| Windows 10, version 2004 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Not supported | Not supported |
| Windows 10, version 20H2 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Not supported | Not supported |
| Windows 10, version 21H1 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Not supported | Not supported |
| Windows 10, version 21H2 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Not supported | Not supported |
| Windows 10, version 22H2 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Not supported | Not supported |
| Windows Server 2022 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled |
| Windows 11, version 21H2 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled |
| Windows 11, version 22H2 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled |
| Windows 11, version 23H2 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled |
| Windows Server 2025 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled |
| Windows 11, version 24H2 | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled | Enabled |
DTLS protocol version support
The following lists the Microsoft Schannel Provider support of DTLS protocol versions.
Tip
You may need to scroll horizontally or select Expand table to view all columns in this table.
| Windows OS | DTLS 1.0 Client | DTLS 1.0 Server | DTLS 1.2 Client | DTLS 1.2 Server |
|---|---|---|---|---|
| Windows Vista/Windows Server 2008 | Not supported | Not supported | Not supported | Not supported |
| Windows Server 2008 with SP2 | Not supported | Not supported | Not supported | Not supported |
| Windows 7/Windows Server 2008 R2 | Enabled | Enabled | Not supported | Not supported |
| Windows 8/Windows Server 2012 | Enabled | Enabled | Not supported | Not supported |
| Windows 8.1/Windows Server 2012 R2 | Enabled | Enabled | Not supported | Not supported |
| Windows 10, version 1507 | Enabled | Enabled | Not supported | Not supported |
| Windows 10, version 1511 | Enabled | Enabled | Not supported | Not supported |
| Windows 10, version 1607/Windows Server 2016 Standard | Enabled | Enabled | Enabled | Enabled |
| Windows 10, version 1703 | Enabled | Enabled | Enabled | Enabled |
| Windows 10, version 1803 | Enabled | Enabled | Enabled | Enabled |
| Windows 10, version 1809 | Enabled | Enabled | Enabled | Enabled |
| Windows 10, version 1903 | Enabled | Enabled | Enabled | Enabled |
| Windows 10, version 1909 | Enabled | Enabled | Enabled | Enabled |
| Windows 10, version 2004 | Enabled | Enabled | Enabled | Enabled |
| Windows 10, version 20H2 | Enabled | Enabled | Enabled | Enabled |
| Windows 10, version 21H1 | Enabled | Enabled | Enabled | Enabled |
| Windows Server 2022 | Enabled | Enabled | Enabled | Enabled |
| Windows 11 | Enabled | Enabled | Enabled | Enabled |
| Windows Server 2025 | Enabled | Enabled | Enabled | Enabled |
Pre-TLS standard protocols support
The following lists the Microsoft Schannel Provider support of pre-TLS standard protocols.
Tip
You may need to scroll horizontally or select Expand table to view all columns in this table.
| Windows OS | PCT 1.0 | SSL2 Client | SSL2 Server | SSL3 Client | SSL3 Server |
|---|---|---|---|---|---|
| Windows Vista/Windows Server 2008 | Not supported | Disabled | Enabled | Enabled | Enabled |
| Windows Server 2008 with SP2 | Not supported | Disabled | Enabled | Enabled | Enabled |
| Windows 7/Windows Server 2008 R2 | Not supported | Disabled | Enabled | Enabled | Enabled |
| Windows 8/Windows Server 2012 | Not supported | Disabled | Disabled | Enabled | Enabled |
| Windows 8.1/Windows Server 2012 R2 | Not supported | Disabled | Disabled | Enabled | Enabled |
| Windows 10, version 1507 | Not supported | Disabled | Disabled | Enabled | Enabled |
| Windows 10, version 1511 | Not supported | Disabled | Disabled | Enabled | Enabled |
| Windows 10, version 1607/Windows Server 2016 Standard | Not supported | Not supported | Not supported | Disabled | Disabled |
| Windows 10, version 1703 | Not supported | Not supported | Not supported | Disabled | Disabled |
| Windows 10, version 1803 | Not supported | Not supported | Not supported | Disabled | Disabled |
| Windows 10, version 1809 | Not supported | Not supported | Not supported | Disabled | Disabled |
| Windows 10, version 1903 | Not supported | Not supported | Not supported | Disabled | Disabled |
| Windows 10, version 1909 | Not supported | Not supported | Not supported | Disabled | Disabled |
| Windows 10, version 2004 | Not supported | Not supported | Not supported | Disabled | Disabled |
| Windows 10, version 20H2 | Not supported | Not supported | Not supported | Disabled | Disabled |
| Windows 10, version 21H1 | Not supported | Not supported | Not supported | Disabled | Disabled |
| Windows Server 2022 | Not supported | Not supported | Not supported | Disabled | Disabled |
| Windows 11 | Not supported | Not supported | Not supported | Disabled | Disabled |
| Windows Server 2025 | Not supported | Not supported | Not supported | Disabled | Disabled |
Important
Beginning with Windows 10, version 1607 and Windows Server 2016, SSL 2.0 has been removed and is no longer supported.
Tip
All versions of Windows will accept a unified format "ClientHello" message even when SSL version 2 is disabled or no longer supported.