c# - 从 WinService 上传 FTP 失败

Question

我制作了一个小型测试应用程序 (WinForms C#) 来测试 FTP 上传。这非常有效。

我尝试在我当前正在处理的 Windows 服务中使用完全相同的方法，但我得到“(426) 连接已关闭；传输中止。'-消息。

我已经多次确认该方法的参数完全相同。他们是!接下来想到的是我的服务运行的帐户，但我已经尝试了所有可能性，甚至以“用户”身份运行服务，提供我自己的凭据。那么它应该像 WinForms 应用程序一样运行，对吗？不，它没有!

它一直运行良好，直到 using (var requestStream = request.GetRequestStream()) 行出现故障。

有问题的 FTP 服务器只允许事件连接，因此 request.UsePassive 设置为 false。

有人知道吗？

       public void UploadToFtp(string url, string filePath, string username, string password, bool mode)
    {
        var fileName = Path.GetFileName(filePath);
        var request = (FtpWebRequest)WebRequest.Create(url + fileName);

        request.Method = WebRequestMethods.Ftp.UploadFile;
        request.Credentials = new NetworkCredential(username, password);
        request.UsePassive = !mode;
        request.UseBinary = true;
        request.KeepAlive = false;

        using (var fileStream = File.OpenRead(filePath))
        {
            using (var requestStream = request.GetRequestStream())
            {
                fileStream.CopyTo(requestStream);
                requestStream.Close();
            }
        }

        var response = (FtpWebResponse)request.GetResponse();
        response.Close();
    }

添加两种场景的跟踪日志:

使用 Windows 应用程序:

 WebRequest::Create(ftp://someurl/somefile.txt)
 FtpWebRequest#63289421::.ctor(ftp://someurl/somefile.txt)
 Exiting WebRequest::Create()   -> FtpWebRequest#63289421
 Current OS installation type is 'Client'.
 RAS supported: True
 ServicePoint#14173886::ServicePoint(someurl:21)
 FtpWebRequest#63289421::GetRequestStream()
 FtpWebRequest#63289421::GetRequestStream(Method=STOR.)
 FtpControlStream#22525719 - Created connection from 10.10.10.103:1865 to nnn.nnn.nnn.nnn:21.
 Associating FtpWebRequest#63289421 with FtpControlStream#22525719
 FtpControlStream#22525719 - Received response [xxxx
   someurl>PROD server
   Port21>Use active mode> 
   xxxx]
 Sending command [USER myusername]
 Received response [331 Enter password]
 Sending command [PASS ********]
 Received response [230-User logged in
 Hi,I'am datagear PROD.
 230 User logged in]
 Sending command [OPTS utf8 on]
 Received response [200 Command OPTS succeed]
 Sending command [PWD]
 Received response [257 "/CitData" is current directory]
 Sending command [TYPE I]
 Received response [200 Transfer mode set to BINARY]
 Sending command [PORT 10,10,10,103,7,74]
 Received response [200 Command PORT succeed]
 Sending command [STOR somefile.txt]
 Received response [150 Uploading in BINARY file somefile.txt]
 Exiting FtpWebRequest#63289421::GetRequestStream() 
 Received response [226 Transfer completed]
 Sending command [QUIT]
 Received response [221-bye
 Bye-Bye,see you again.

使用 Windows 服务:

 WebRequest::Create(ftp://someurl/somefile.txt)
 FtpWebRequest#63289421::.ctor(ftp://someurl/somefile.txt)
 Exiting WebRequest::Create()   -> FtpWebRequest#25425822
 Current OS installation type is 'Client'.
 ServicePoint#31665793::ServicePoint(someurl:21)
 FtpWebRequest#25425822::GetRequestStream()
 FtpWebRequest#25425822::GetRequestStream(Method=STOR.)
 FtpControlStream#51484875 - Created connection from 10.10.10.103:1759 to nnn.nnn.nnn.nnn:21.
 Associating FtpWebRequest#25425822 with FtpControlStream#51484875
 FtpControlStream#51484875 - Received response [xxxx
   someurl>PROD server
   Port21>Use active mode> 
   xxxx]
 Sending command [USER myusername]
 Received response [331 Enter password]
 Sending command [PASS ********]
 Received response [230-User logged in
 Hi,I'am datagear PROD.
 230 User logged in]
 Sending command [OPTS utf8 on]
 Received response [200 Command OPTS succeed]
 Sending command [PWD]
 Received response [257 "/CitData" is current directory]
 Sending command [TYPE I]
 Received response [200 Transfer mode set to BINARY]
 Sending command [PORT 10,10,10,103,6,224]
 Received response [200 Command PORT succeed]
 Sending command [STOR somefile.txt]
 Received response [426 Transfer failed]
 (Releasing FTP connection#51484875.)
 GetRequestStream - The remote server returned an error: (426) Connection closed; transfer aborted..
   at System.Net.FtpWebRequest.SyncRequestCallback(Object obj)
   at System.Net.CommandStream.Dispose(Boolean disposing)
   at System.IO.Stream.Close()
   at System.Net.ConnectionPool.Destroy(PooledStream pooledStream)
   at System.Net.ConnectionPool.PutConnection(PooledStream pooledStream, Object owningObject, Int32 creationTimeout, Boolean canReuse)
   at System.Net.FtpWebRequest.FinishRequestStage(RequestStage stage)
   at System.Net.FtpWebRequest.GetRequestStream()
 Exiting FtpWebRequest#25425822::GetRequestStream()  

有效的有一行内容为“RAS Supported”。也许有趣，不知道。

Answer 1

Windows 防火墙导致了问题。从 WinService 运行时，我必须为此服务打开防火墙。当从 VS 环境运行时，防火墙似乎已经为 VS 打开(尽管 WinFirewall 中的直通应用程序列表没有显示)因此一切似乎都运行良好。