Enum SslProtocols

Namespace

System.Net.Security

Assembly

System.Net.dll

Defines the possible versions of SslProtocols. This enumeration supports a bitwise combination of its member values.

[Flags]
public enum SslProtocols

Fields

None = 0

Allows the operating system to choose the best protocol to use, and to block protocols that are not secure. Unless your app has a specific reason not to, you should use this value.

[Obsolete("This value is obsolete and unsecured and will be removed in a future version.")] Tls = 192

Specifies the TLS 1.0 security protocol. TLS 1.0 is provided for backward compatibility only. The TLS protocol is defined in IETF RFC 2246. This member is obsolete and will be removed in a future version.

If the underlying platform does not support TLS 1.0, the connection attempt will use the minimum version supported instead.

[Obsolete("This value is obsolete and unsecured and will be removed in a future version.")] Tls11 = 768

Specifies the TLS 1.1 security protocol. The TLS protocol is defined in IETF RFC 4346. This member is obsolete and will be removed in a future version.

If the underlying platform does not support TLS 1.1, the connection attempt will use the minimum version supported instead.

Tls12 = 3072

Specifies the TLS 1.2 security protocol. The TLS protocol is defined in IETF RFC 5246.

Tls13 = 12288

Specifies the TLS 1.3 security protocol. The TLS protocol is defined in IETF RFC 8446.

Remarks

During the handshake, the client sends a list of SSL versions and the server chooses the best matching version from that list.

Note: Following the full .NET implementation, .NET nanoFramework does not have any of the SSL nor Default because those are deprecated and unsecure.