$ftprespsonse = [System.Net.FtpWebResponse]$ftp.GetResponse()

$username="user"
$password="pw"
$ftp = [System.Net.FtpWebRequest]::Create("ftp://xxx.xxx.xxx:{port}/file.txt")
$ftp = [System.Net.FtpWebRequest]$ftp
$ftp.Method = [System.Net.WebRequestMethods+Ftp]::UploadFile
$ftp.Credentials = new-object System.Net.NetworkCredential($username,$password)
$ftp.UseBinary = $true
$ftp.UsePassive = $true
$ftp.EnableSsl = $true
$ftp.KeepAlive = $false
$ftprespsonse = [System.Net.FtpWebResponse]$ftp.GetResponse()
$content = [System.IO.File]::ReadAllBytes("c:file.txt")
$ftp.ContentLength = $content.Length
try
{
    $rs = $ftp.GetRequestStream()
    $rs.Write($content, 0, $content.Length)
    'File Uploaded.'
    Write-Host 'Status code: ' + $ftprespsonse.StatusCode
    Write-Host 'Status descriptionL: ' + $ftprespsonse.StatusDescription
    $ftprespsonse.close()
    $ftp.Abort()
    $rs.Close()
    $rs.Dispose()
}
catch [System.Exception]
{
    'Upload failed.'
    $ftprespsonse = [System.Net.FtpWebResponse]$ftp.GetResponse()
    Write-Host 'Status code: ' + $ftprespsonse.StatusCode
    Write-Host 'Status descriptionL: ' + $ftprespsonse.StatusDescription
    $ftprespsonse.close()
    $ftp.Abort()
}

File Uploaded.
Status code:  + ClosingData
Status descriptionL:  + 226- Transfer complete - acknowledgment message is pending.
226- Transfer complete - acknowledgment message is pending.
226 Transfer complete (Batch Number = 30009).