powershell – System.Net.Webclient仅下载81.4 MB(85,363,075字

[string] $fileName = "en_sql_server_2008_r2_developer_x86_x64_ia64_dvd_522665.iso"
[string] $url = "http://installers.abc/iso/$filename"
[string] $tempPath = "c:balpreet"

function Download-Iso {
  Param(
    [string] $FileName,[string] $Url,[string] $destinationFolder 
  )

  [string] $destination = Join-Path -Path $tempPath -ChildPath $fileName 
  write-host "downloading from : $url to $destination"
    $client = new-object System.Net.WebClient
    $client.DownloadFile( $Url,$destination )

}

Download-Iso -FileName $fileName -Url $url -DestinationFolder = $tempPath

我试图从http可访问的远程位置下载4.07 GB(4,380,329,984字节)ISO.

Windows 7：下载完整的4.07 GB文件.

Windows Server 2008 R2：
它只下载81.4 MB(85,363,075字节)并假装完成下载.代码不会抛出任何错误,但也不会下载完整的文件.

有什么线索的原因？