FtpWebRequest 测试环境连接失败

Posted 2023-02-16

【中文标题】FtpWebRequest 测试环境连接失败

【英文标题】：FtpWebRequest Fail to connect in Testing environment

【发布时间】：2017-01-24 13:05:38

【问题描述】：

我正在尝试连接到 FTP 服务器并收到超时错误，在我这端它可以工作，但在测试环境中我收到超时错误，我已禁用防火墙，将 url 替换为 IP，但它仍然没有在那里工作

我正在使用此代码：

var remoteFTPPath = ftpServer.StartsWith("ftp://") ? ftpServer : string.Format("ftp://0", ftpServer);
            var request = (FtpWebRequest)WebRequest.Create(remoteFTPPath);
            var networkCredentials = new NetworkCredential(userName, password);
            request.Method = WebRequestMethods.Ftp.ListDirectory;
            request.Credentials = networkCredentials;
            response = request.GetResponse();
            
            finally
            
                 response.Close();
                 response.Dispose();

            

我在主动和被动模式下都遇到错误

主动模式：

System.Net Information: 0 : [4784] FtpControlStream#1013293 - Sending command [PORT -----]
System.Net Information: 0 : [4784] FtpControlStream#1013293 - Received response [200 PORT command successful.]
System.Net Information: 0 : [4784] FtpControlStream#1013293 - Sending command [NLST]
System.Net Information: 0 : [4784] FtpControlStream#1013293 - Received response [150 Opening BINARY mode data connection.]
System.Net Information: 0 : [10856] ServicePoint#50726992 - Closed as idle.
System.Net Information: 0 : [4784] FtpWebRequest#54814357::(Releasing FTP connection#1013293.)
System.Net Error: 0 : [4784] Exception in FtpWebRequest#54814357::GetResponse - The operation has timed out.
   at System.Net.FtpWebRequest.SyncRequestCallback(Object obj)
   at System.Net.FtpWebRequest.RequestCallback(Object obj)
   at System.Net.CommandStream.Dispose(Boolean disposing)
   at System.IO.Stream.Close()
   at System.IO.Stream.Dispose()
   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.GetResponse()

被动模式

System.Net Information: 0 : [4784] FtpControlStream#1013293 - Sending command [TYPE I]
System.Net Information: 0 : [4784] FtpControlStream#1013293 - Received response [200 Type set to I.]
System.Net Information: 0 : [4784] FtpControlStream#1013293 - Sending command [PASV]
System.Net Information: 0 : [4784] ServicePoint#50726992 - Closed as idle. 
System.Net Information: 0 : [4784] FtpWebRequest#54814357::(Releasing FTP connection#1013293.)
System.Net Error: 0 : [4784] Exception in FtpWebRequest#54814357::GetResponse - The operation has timed out.
   at System.Net.FtpWebRequest.SyncRequestCallback(Object obj)
   at System.Net.FtpWebRequest.RequestCallback(Object obj)
   at System.Net.CommandStream.Dispose(Boolean disposing)
   at System.IO.Stream.Close()
   at System.IO.Stream.Dispose()
   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.GetResponse()

【问题讨论】：

登录文本机器并尝试使用常规客户端连接到 FTP 服务器。似乎服务器在初始连接后没有响应任何命令。

感谢您的回答，但适用于 Filezilla

【参考方案1】：

尝试设置request.UseBinary = true;。