☰

PowerShell ftp get 不会在 Windows Server 上保存

tag-icon • tag-icon ftp windows-server-2012 powershell windows-server-2012-r2
PowerShell ftp get 不会在 Windows Server 上保存

从 Windows Server 2012，使用PoweShell，我通过连接到远程设备ftp并运行get以检索文件。该过程顺利完成，但文件未保存到我的本地计算机上。命令返回Operation Complete，几秒钟后连接关闭。

Operation CompleteConnection closed by remote host.
ftp>

在目标位置，0在过程开始时会创建一个大小为的临时文件，并且该文件保持不变。Tmp6A94.tmp

我尝试按照以下方法打开防火墙如何为被动模式 FTP 服务器配置 Windows 防火墙

netsh advfirewall firewall add rule name=”FTP Service” dir=in protocol=TCP enable=yes action=allow profile=any service=ftpsvc localport=any 
netsh advfirewall set global StatefulFTP disable

我错过了什么？

编辑1

我已经ftp在另一台 WS2012 和一台 WS2012R2 上测试了该行为，这两台机器没有同样的问题。它们都没有防火墙 ftp 被动模式。我想知道是否还有其他防火墙规则可以启用 ftp 传输。

编辑2

这是PowerShell我用来通过以下方式从远程设备检索文件的脚本ftp：

function getFTPFile([String]$fileName)
{
    $ftpUser = "user"
    $ftpPassword = "password"
    $ftpServer = "ftpServer"

    $webclient = New-Object System.Net.WebClient 
    $webclient.Credentials = New-Object System.Net.NetworkCredential($ftpUser, $ftpPassword)

    $uri = New-Object System.Uri("$ftpServer/files")

    $webclient.DownloadFile($uri, $fileName)
}

运行此脚本或从控制台手动执行此脚本PowerShell都会产生相同的结果。一切都将正常运行，直到文件需要保存在目标上。我已在其他 Windows 服务器上成功使用了此脚本。

这是脚本抛出的错误：

Exception calling "DownloadFile" with "2" argument(s): "The remote server returned an error: 150-Starting operation:
STATUS: Getting logs ...
Please wait...
Please wait...
STATUS: Finished getting logs
STATUS: get logs operation is complete
Size: 8262246 bytes
Please wait for 8 seconds ...
Operation Complete150-Accepted data connection
150 (8262246 bytes) to download
."
At C:\Users\administrator\getFTPFile.ps1:73 char:2
+     $webclient.DownloadFile($uri, $fileName)
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : WebException

这是提示失败的操作PowerShell：

ftp> get logs logsFile
200 PORT command successful
150-Starting operation:
STATUS: Getting logs ...
Please wait...
Please wait...
STATUS: Finished getting logs
STATUS: get logs operation is complete
Size: 8283146 bytes
Please wait for 8 seconds ...

Operation CompleteConnection closed by remote host.

这是传输成功时的输出：

ftp> get logs logsFile
200 PORT command successful
150-Starting operation:
STATUS: Getting logs ...
Please wait...
Please wait...
STATUS: Finished getting logs
STATUS: get logs operation is complete
Size: 8283146 bytes
Please wait for 8 seconds ...

Operation Complete150-Connecting to port 63596
150 (8275012 bytes) to download
226-File successfully transferred
226 0.778 seconds (measured here), 10.15 Mbytes per second
ftp: 8275012 bytes received in 0.76Seconds 10916.90Kbytes/sec.

另外，我还没有尝试过任何其他 FTP 客户端。

编辑3

ftp现在，当从终端使用时它可以工作PowerShell，而不能通过脚本工作，从运行PowerShell。

答案1

我不确定该方法背后的具体过程WebClient::DownloadFile，但在我看来，它会在下载传输完成之前中断 ftp 连接，导致操作失败。

通过使用异步方法，我成功下载了文件。
这是我使用以下更新的函数：WebClient::DownloadFileTaskAsync方法。我还实施了状态检查。

function getFTPfile([String]$fileName)
{
    $ftpUser = "user"
    $ftpPassword = "password"
    $ftpServer = "ftpServer"

    $webclient = New-Object System.Net.WebClient 
    $webclient.Credentials = New-Object System.Net.NetworkCredential($ftpUser, $ftpPassword)

    $uri = New-Object System.Uri("$ftpServer/files")

    $job = $webclient.DownloadFileTaskAsync($uri, $fileName) 

    while(!$job.IsCompleted)
    { 
        Write-Host "Downloading file..."
        sleep 10
    }
    if($job.Status -ne "RanToCompletion")
        { Write-Host "Failed to download file." }
    else
        { Write-Host "Download successful." }
}

相关内容