FluentFTP - 连接时出错“尝试从套接字流中读取数据超时！”

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尝试从套接字流中读取数据超时！

使用FluentFTP连接到FTP时。

以下是我用来连接的源代码：

Console.WriteLine("Configuring FTP to Connect to {0}", hostname);
ftp = new FtpClient(hostname,port,new NetworkCredential(username,password));               
ftp.ConnectTimeout = 600000;               
ftp.ReadTimeout = 60000;
ftp.EncryptionMode = FtpEncryptionMode.Explicit;
ftp.SslProtocols = System.Security.Authentication.SslProtocols.Tls;
ftp.ValidateCertificate += new FtpSslValidation(OnValidateCertificate);
ftp.Connect();
Console.WriteLine("Connected to {0}", hostname);

ftp.SetWorkingDirectory(foldername);
Console.WriteLine("Changed directory to {0}", foldername);

                

void OnValidateCertificate(FtpClient control, FtpSslValidationEventArgs e)
{
    // add logic to test if certificate is valid here
    e.Accept = true;
}

FileZilla日志文件，用于成功连接。我可以通过FileZilla连接位置。日志片段如下：

2017-12-08 13:34:33 17672 1 Status: Connecting to xx.xx.xx.xx:990...
2017-12-08 13:34:33 17672 1 Status: Connection established, initializing TLS...
2017-12-08 13:34:33 17672 1 Status: Verifying certificate...
2017-12-08 13:35:06 17672 1 Status: TLS connection established, waiting for welcome message...
2017-12-08 13:35:06 17672 1 Response: 220-Microsoft FTP Service
2017-12-08 13:35:06 17672 1 Status: Invalid character sequence received, disabling UTF-8. Select UTF-8 option in site manager to force UTF-8.
2017-12-08 13:35:06 17672 1 Response:     Warning: This IT system is restricted to company authorised users only, including authorised third parties. Unauthorised access or use is a violation of Company’s policies and potentially the law. 
2017-12-08 13:35:06 17672 1 Response:     
2017-12-08 13:35:06 17672 1 Response: 220 Our IT systems may be monitored for administrative and security reasons. By proceeding, you acknowledge that you have read and understood this notice and that you consent to the monitoring. [ftps0]
2017-12-08 13:35:06 17672 1 Command: USER ftp_usr_comp_ext
2017-12-08 13:35:06 17672 1 Response: 331 Password required
2017-12-08 13:35:06 17672 1 Command: PASS ****************
2017-12-08 13:35:06 17672 1 Response: 230 User logged in.
2017-12-08 13:35:06 17672 1 Command: SYST
2017-12-08 13:35:06 17672 1 Response: 215 Windows_NT
2017-12-08 13:35:06 17672 1 Command: FEAT
2017-12-08 13:35:06 17672 1 Response: 211-Extended features supported:
2017-12-08 13:35:06 17672 1 Response:  LANG EN*
2017-12-08 13:35:06 17672 1 Response:  UTF8
2017-12-08 13:35:06 17672 1 Response:  AUTH TLS;TLS-C;SSL;TLS-P;
2017-12-08 13:35:06 17672 1 Response:  PBSZ
2017-12-08 13:35:06 17672 1 Response:  PROT C;P;
2017-12-08 13:35:06 17672 1 Response:  CCC
2017-12-08 13:35:06 17672 1 Response:  HOST
2017-12-08 13:35:06 17672 1 Response:  SIZE
2017-12-08 13:35:06 17672 1 Response:  MDTM
2017-12-08 13:35:06 17672 1 Response:  REST STREAM
2017-12-08 13:35:06 17672 1 Response: 211 END
2017-12-08 13:35:06 17672 1 Command: PBSZ 0
2017-12-08 13:35:07 17672 1 Response: 200 PBSZ command successful.
2017-12-08 13:35:07 17672 1 Command: PROT P
2017-12-08 13:35:07 17672 1 Response: 200 PROT command successful.
2017-12-08 13:35:07 17672 1 Status: Logged in
2017-12-08 13:35:07 17672 1 Status: Retrieving directory listing of "/Prod/Outbound"...
2017-12-08 13:35:07 17672 1 Command: CWD /Prod/Outbound
2017-12-08 13:35:07 17672 1 Response: 250 CWD command successful.

堆栈追踪：

   at FluentFTP.FtpSocketStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at FluentFTP.FtpSocketStream.ReadLine(Encoding encoding)
   at FluentFTP.FtpClient.GetReply()
   at FluentFTP.FtpClient.Handshake()
   at FluentFTP.FtpClient.Connect()
   at ASOSSFTP.DownloadFile.DownloadFileFromFTP()

Answer 1

以下代码是您获得FluentFtp（至少nuget（1.0.5824.34026）使用安全连接所需的全部代码。

        FtpClient fclient = new FtpClient(hostname, username, password); // or set Host & Credentials

        fclient.EncryptionMode = FtpEncryptionMode.Implicit;  
        fclient.SslProtocols = SslProtocols.Tls12;

        //client.Port = 990;  // Not required - probably gives you exceptions if you try to set it. 

        fclient.Connect();
        fclient.UploadFile(@"C:\tmp\a.txt", "big.txt");

Answer 2

在FileZilla中，您将连接到隐式 FTPS端口990。

如果您也在C＃中使用此端口，则无法使用FtpEncryptionMode.Explicit。

使用FtpEncryptionMode.Implicit。

虽然您最好连接到端口21并继续使用FtpEncryptionMode.Explicit，但该端口是否可用。