Specifies the security protocols that the PopClient class supports.
This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.
The PopClient class uses the SecurityProtocols enumeration to specify one or more security protocols to be used when establishing a connection with a remote host. Multiple protocols may be specified if necessary and the actual protocol used will be negotiated with the remote host. It is recommended that most applications use protocolDefault when creating a secure connection.
| Member Name | Description | Value |
|---|---|---|
| protocolNone | No security protocol will be used, a secure connection will not be established. | 0 |
| protocolSSL2 | The SSL 2.0 protocol has been selected. This protocol has been deprecated and is no longer widely used. It is not recommended that this protocol be used when establishing secure connections. | 1 |
| protocolSSL3 | The SSL 3.0 protocol has been selected. This protocol has been deprecated and is no longer widely used. It is not recommended that this protocol be used when establishing secure connections. In most cases, this protocol is only selected if TLS is not supported by the server. | 2 |
| protocolTLS10 | The TLS 1.0 protocol has been selected. This version of the protocol is commonly used by older servers and is the only version of TLS supported on Windows platforms prior to Windows 7 SP1 and Windows Server 2008 R2. | 4 |
| protocolTLS11 | The TLS 1.1 protocol has been selected. This version of TLS is supported on Windows 7 SP1 and Windows Server 2008 R2 and later versions of the operating system. | 8 |
| protocolTLS12 | The TLS 1.2 protocol has been selected. This is the default version of the protocol and is supported on Windows 7 SP1 and Windows Server 2008 R2 and later versions of Windows. It is recommended that you use this version of TLS. | 16 |
| protocolTLS13 | The TLS 1.3 protocol has been selected. This is the latest version of the protocol and is only supported on Windows 11, Windows Server 2022 and later. If this protocol version is not supported, TLS 1.2 will be used instead. | 32 |
| protocolSSL | Any version of the Secure Sockets Layer (SSL) protocol should be used. The actual protocol version used will be negotiated with the remote host. | 3 |
| protocolTLS | Any version of the the Transport Layer Security (TLS) protocol should be used. The actual protocol version used will be negotiated with the remote host, with with preference for TLS 1.2. | 28 |
| protocolTLS1 | Version 1.0, 1.1 or 1.2 of the the Transport Layer Security (TLS) protocol should be used. The actual protocol version used will be negotiated with the remote host, with preference for TLS 1.2. | 28 |
| protocolDefault | The default selection of security protocols will be used when establishing a connection. The TLS 1.2, 1.1 and 1.0 protocols will be negotiated with the host, in that order of preference. This option will always request the latest version of the preferred security protocols and is the recommended value. | 16 |
| protocolUnknown | An unknown or unsupported security protocol has been specified. This value indicates an error condition. | 4096 |
Namespace: SocketTools
Assembly: SocketTools.PopClient (in SocketTools.PopClient.dll)