FTPWebRequest BeginGetRequestStream从不触发回调，GetRequestStream操作超时 [英] FTPWebRequest BeginGetRequestStream never fires callback, GetRequestStream operation timed out

问题描述

HI，

我正在使用FTPWebRequest来异步上传文件。当我使用BeginGetRequestStream方法时，我的回调永远不会执行。为了调试，我简化并调用了GetRequestStream，并且每当我得到"操作超时"时。我正在使用EnableSSL = true。这是使用异步模式的跟踪输出的尾部。无论我等待多久，它都不会超过这一点。

System.Net信息：0：[4368] FtpControlStream＃59321765 - 收到响应[200 PORT命令成功] System.Net Information ：0：[4368] FtpControlStream＃59321765 - 发送命令[STOR test.txt]
System.Net.Sockets详细：0：[4368]套接字＃37710717 :: BeginSend（）
System.Net.Sockets详细：0：[4368]退出套接字＃37710717 :: BeginSend（） - > OverlappedAsyncResult＃20115393
System.Net.Sockets详细：0：[4368]来自Socket的数据＃37710717 :: PostCompletion
System.Net.Sockets详细：0：[4368] 00000000：17 03 01 00 1F A9 5D 78-60 EE 2D D0 E7 8A 3B 61：......] x` .- ...; a
System.Net.Sockets详细：0：[4368] 00000010：22 14 1D 12 59 2F 2A 40-5D 92 AE 72 7F 49 D5 C3：" ... Y / * @] .. rI 。 。
System.Net.Sockets详细：0：[4368] 00000020：A5 97 3F 15：..？。
System.Net.Sockets详细：0：[4368]套接字＃37710717 :: EndSend（OverlappedAsyncResult ＃20115393）
System.Net.Sockets详细：0：[4368]退出套接字＃37710717 :: EndSend（） - > 36＃36
System.Net.Sockets详细：0：[4368]套接字＃37710717 :: BeginReceive（）
System.Net.Sockets详细：0：[4368]退出套接字＃37710717 :: BeginReceive（） - > OverlappedAsyncResult＃5726763
System.Net.Sockets详细：0：[4368]来自Socket的数据＃37710717 :: PostCompletion
System.Net.Sockets详细：0：[4368] 00000000：17 03 01 00 2A :. ... *
System.Net.Sockets详细：0：[4368]套接字＃37710717 :: EndReceive（OverlappedAsyncResult＃5726763）
System.Net.Sockets详细：0：[4368]退出套接字＃37710717： ：EndReceive（） - > 5＃5
System.Net.Sockets详细：0：[4368]套接字＃37710717 :: BeginReceive（）
System.Net.Sockets详细：0：[4368]退出套接字＃37710717 :: BeginReceive（） - > OverlappedAsyncResult＃57990079
System.Net.Sockets详细：0：[4368]来自套接字的数据＃37710717 :: PostCompletion
System.Net.Sockets详细：0：[4368] 00000000：A0 78 BB E0 82 F9 B5 3C-3A CA E2 6C B6 75 09 30：.x .....<：.. lu0
System.Net.Sockets详细：0：[4368] 00000010：0B 41 1D E5 05 60 5E 6F -F6 73 D9 BA 54 E4 2B 4F：.A ...`^ os.T. + O
System.Net.Sockets详细：0：[4368] 00000020：4E 0E A4 26 9A 17 A2 19-09 21：N ..& .....！
System.Net.Sockets详细：0：[4368]套接字＃37710717 :: EndReceive（OverlappedAsyncResult＃57990079）
System.Net.Sockets详细：0 ：[4368]退出套接字＃37710717 :: EndReceive（） - > 42＃42
System.Net信息：0：[4368] FtpControlStream＃59321765 - 收到响应[150 STOR命令已启动]
System.Net.Sockets详细：0：[4368]套接字＃25897445 :: BeginAccept（ ）
System.Net.Sockets详细：0：[4368]套接字＃17100198 ::套接字（InterNetwork＃2）
System.Net.Sockets详细：0：[4368]退出套接字＃17100198 ::套接字（ ）
System.Net.Sockets详细：0：[4368]退出套接字＃25897445 :: BeginAccept（） - > AcceptOverlappedAsyncResult＃35187200

 
    I am using FTPWebRequest to asynchronously upload a file.  When I use the BeginGetRequestStream method, my callback is never executed.  To debug, I simplified and just called GetRequestStream, and every time I got "operation timed out."  I am using EnableSSL=true.  Here is the tail of my trace output using the asynchrous pattern.  No matter how long I wait, it never progresses past this point.

System.Net Information: 0 : [4368] FtpControlStream#59321765 - Received response [200 PORT command successful]System.Net Information: 0 : [4368] FtpControlStream#59321765 - Sending command [STOR test.txt]
System.Net.Sockets Verbose: 0 : [4368] Socket#37710717::BeginSend()
System.Net.Sockets Verbose: 0 : [4368] Exiting Socket#37710717::BeginSend()  -> OverlappedAsyncResult#20115393
System.Net.Sockets Verbose: 0 : [4368] Data from Socket#37710717::PostCompletion
System.Net.Sockets Verbose: 0 : [4368] 00000000 : 17 03 01 00 1F A9 5D 78-60 EE 2D D0 E7 8A 3B 61 : ......]x`.-...;a
System.Net.Sockets Verbose: 0 : [4368] 00000010 : 22 14 1D 12 59 2F 2A 40-5D 92 AE 72 7F 49 D5 C3 : "...Y/*@]..r.I..
System.Net.Sockets Verbose: 0 : [4368] 00000020 : A5 97 3F 15                                     : ..?.
System.Net.Sockets Verbose: 0 : [4368] Socket#37710717::EndSend(OverlappedAsyncResult#20115393)
System.Net.Sockets Verbose: 0 : [4368] Exiting Socket#37710717::EndSend()  -> 36#36
System.Net.Sockets Verbose: 0 : [4368] Socket#37710717::BeginReceive()
System.Net.Sockets Verbose: 0 : [4368] Exiting Socket#37710717::BeginReceive()  -> OverlappedAsyncResult#5726763
System.Net.Sockets Verbose: 0 : [4368] Data from Socket#37710717::PostCompletion
System.Net.Sockets Verbose: 0 : [4368] 00000000 : 17 03 01 00 2A                                  : ....*
System.Net.Sockets Verbose: 0 : [4368] Socket#37710717::EndReceive(OverlappedAsyncResult#5726763)
System.Net.Sockets Verbose: 0 : [4368] Exiting Socket#37710717::EndReceive()  -> 5#5
System.Net.Sockets Verbose: 0 : [4368] Socket#37710717::BeginReceive()
System.Net.Sockets Verbose: 0 : [4368] Exiting Socket#37710717::BeginReceive()  -> OverlappedAsyncResult#57990079
System.Net.Sockets Verbose: 0 : [4368] Data from Socket#37710717::PostCompletion
System.Net.Sockets Verbose: 0 : [4368] 00000000 : A0 78 BB E0 82 F9 B5 3C-3A CA E2 6C B6 75 09 30 : .x.....<:..l.u.0
System.Net.Sockets Verbose: 0 : [4368] 00000010 : 0B 41 1D E5 05 60 5E 6F-F6 73 D9 BA 54 E4 2B 4F : .A...`^o.s..T.+O
System.Net.Sockets Verbose: 0 : [4368] 00000020 : 4E 0E A4 26 9A 17 A2 19-09 21                   : N..&.....!
System.Net.Sockets Verbose: 0 : [4368] Socket#37710717::EndReceive(OverlappedAsyncResult#57990079)
System.Net.Sockets Verbose: 0 : [4368] Exiting Socket#37710717::EndReceive()  -> 42#42
System.Net Information: 0 : [4368] FtpControlStream#59321765 - Received response [150 STOR command started]
System.Net.Sockets Verbose: 0 : [4368] Socket#25897445::BeginAccept()
System.Net.Sockets Verbose: 0 : [4368] Socket#17100198::Socket(InterNetwork#2)
System.Net.Sockets Verbose: 0 : [4368] Exiting Socket#17100198::Socket()
System.Net.Sockets Verbose: 0 : [4368] Exiting Socket#25897445::BeginAccept()  -> AcceptOverlappedAsyncResult#35187200

推荐答案

做你有防火墙阻止传入连接尝试？尝试将FTPWebRequest配置为使用被动模式。

do you have a firewall that blocks incoming connection attempts ? try configuring FTPWebRequest to use passive mode instead.

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