C# CoreFTP - SFTP Connection Failing - connection timeout

Question

I'm using this library with C# to connect and upload files to a server: https://www.nuget.org/packages/CoreFtp/

I'm able to connect to FTP sites, but attempts made with SFTP respond with a connection timeout.

Anyone have an example of what to do when establishing a connection with SFTP?

Here's an example of what I'm doing:

using (var ftpClient = new FtpClient(new FtpClientConfiguration
                {
                    Host = FTPUrl,
                    Username = FTPUser,
                    Password = FTPPassword,
                    Port = FTPPort, // using port 21 for ftp, and port 22 for sftp
                    EncryptionType = FtpEncryption.Implicit,
                    IgnoreCertificateErrors = true
                }))
                {
                    await ftpClient.LoginAsync();

                    // do something with ftp client
                }