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Determines the protocol to use for connection.
TypeA ProtocolsEnum enumeration. Determines protocol type.
The settings for value are:
|SSH1||2||Secure Shell 1.5 protocol.|
|SSH2||3||Secure Shell 2 protocol.|
|SSHAuto||4||Auto negotiate SSH version.|
The Protocol property is almost always set before a new connection is made with the remote server. Supported values are: Raw, Telnet, SSH1, SSH2 and SSHAuto.
For the Telnet protocol, wodSSH expects to connect only to telnet based servers. Although it may appear that this is the same as the Raw type, Telnet provides additional functionality. Under the hood, the Telnet protocol specification describes specific 'telnet options' that are sent at the beginning of each connection and during the connection, that are not visible to the end user. wodSSH intercepts these codes, and sends answers back to the remote server, providing you with a plain connection.
The Raw protocol is a plaintext protocol (if it can be called a protocol at all). It's purpose is to allow wodSSH to connect to any server which may not be specifically supported, allowing you to send and receive arbitrary data and commands, depending on the remote server type. For instance, you could connect to a remote server on port 25 and send SMTP commands and even send email to someone. Since protocols like SMTP don't have any special codes, there is nothing to interpret, so you will receive exactly what the remote server sent you.
The SSH1 protocol is an 'old-style' SSH protocol, which is most popular among UNIX servers today. Almost all servers that support Telnet also support the SSH1 protocol. It's fully encrypted, and it's known to be secure - as long as the DES algorithm is not used for encryption.
The SSH2 protocol is newer than SSH1 and has a more sophisticated protocol description. It supports far more encryption algorithms and most of them are used with larger key values than in SSH1. Although the name is similar, the protocols are quite different and are not backward compatible.
The SSHAuto protocol is a 'general SSH' protocol. If you set the Protocol property to SSHAuto, then wodSSH will try to negotiate which SSH version to use with the remote server. Some servers support both SSH1 and SSH2, in which case SSH2 will be selected. However, if server is SSH1 then wodSSH will automatically fallback to SSH1 and use it.
You can test the Protocol property during the connection to obtain the protocol type value. Although you may have set it to SSHAuto (for example), wodSSH may change this value internally to SSH1 or SSH2 depending which SSH version it negotiated with the remote server. Please remember that before a new connection is established (with another server) you should set this property back to SSHAuto.
Changing the Protocol property may also affect the Port property. When you set Protocol to Telnet, wodSSH will automatically set the Port property to 23. If any SSH version is set, wodSSH will change the Port property to 22.