my $sftp = Net::SFTP::Foreign->new(
    $sftp_host,
    more => [ '-o', "IdentityFile=$ssh_key_path",
              '-o', 'PreferredAuthentications=keyboard-interactive,password,publickey',
            '-vvv' ],
    user       => $sftp_user,
    password   => $sftp_password,
    passphrase => $sftp_passphrase,
    timeout    => 10,
    port       => $port,
    stderr_fh  => $my_err
);