Preferred Protocol Version
Specifies which version of the SSH protocol is used when a connection is established. Two versions are available: SSH-1 and SSH-2. SSH-2 is a newer, more secure implementation and is the default setting. With this setting FTP will first attempt to connect using SSH-2 and will try SSH-1 if the server does not support SSH-2. Selecting SSH-2 Only or SSH-1 Only will force the connection to this version of the protocol.
Enable Compression
This enables data compression for the SSH connection. With this option enabled, data sent by the server is compressed before sending, and decompressed at the client end. Likewise, data sent to the server is compressed first and the server decompresses it at the other end. This can help with low-bandwidth connections.
Username
The username to be sent to the SSH server can be entered or left blank. If left blank the user is required to type this parameter each time host session is established. For security reasons, passwords cannot be saved and must always be typed by the user.
Private Key File for Authentication
Enter the path to the private key file, or locate it using the Browse button. The .pkk file extension is used for private key files.