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通过 FTPeS 下载文件时莫名其妙地断开连接

tag-icon • tag-icon iis ftp ftpes
通过 FTPeS 下载文件时莫名其妙地断开连接

是什么导致我的连接断开以及为什么？

服务器和客户端之间通过 FTPeS 下载文件每次都会在完全相同的文件数量处停止，没有任何提示取消连接的原因。无论文件有多大或下载这些文件需要多长时间，都无关紧要。服务器端使用哪种服务器软件并不重要，客户端软件也是如此。我在服务器端尝试使用 Microsoft IIS FTP 和 FileZilla Server，在客户端尝试使用 FileZilla Client、WinSCP 和自写客户端 (Delphi)。

在我的示例中，服务器机器 A 和客户端机器 B 之间正好有 296 个 txt 文件。服务器机器 A 和客户端机器 C 之间是另一个数量，但却是恒定/稳定/不变的。

服务器端网络

WAN 连接是德国 ISP Deutsche Telekom AG，VDSL2，具有伪静态公共 IP 地址（持续约一个月，之后会更改）。路由器和硬件防火墙是德国常见的 FRITZ!Box 7590，带有 FRITZ!OS：07.01。

WAN 连接

我已经为 FTP 控制通道和被动模式数据通道配置了端口转发。

  • 控制通道：TCP 21 外部到 21 内部
  • 数据通道：TCP 50000-50010 外部至 50000-50010 内部

转发端口

服务器

服务器机器是 Microsoft Windows 10 Pro 1903（10.0.18362 N/A Build 18362.239），通过 1 Gbps Cat5e FTP 电缆与路由器连接。

Windows Defender 防火墙

我已经在 Windows Defender 防火墙上打开了所需的端口。

在此处输入图片描述

Microsoft IIS FTP 配置

IIS 正在监听 TCP 端口 21 上的控制通道。数据通道设置为 TCP 50000-50010，以符合端口转发。控制通道和数据通道都需要 SSL 连接。

IIS 数据通道端口范围 IIS 监听端口控制通道

FileZila 服务器

相同的配置需要配置。TCP 端口 21（控制）、50000-50010（数据）。

filezilla 服务器配置 1 filezilla 服务器配置 2 filezilla 服务器配置 3

客户

这是通过 IIS 下载时的 FileZilla 客户端日志。

2019-08-04 02:21:44 8736 3 Response: 226 Transfer complete.
2019-08-04 02:21:44 8736 3 Status: File transfer successful, transferred 4.096 bytes in 1 second
2019-08-04 02:21:44 8736 2 Response: 227 Entering Passive Mode (84,145,49,252,195,87).
2019-08-04 02:21:44 8736 2 Command: RETR random_file_433.txt
2019-08-04 02:21:44 8736 3 Status: Starting download of /Files/random_file_432.txt
2019-08-04 02:21:44 8736 3 Command: PASV
2019-08-04 02:21:44 8736 2 Response: 150 Opening BINARY mode data connection.
2019-08-04 02:21:44 8736 3 Response: 227 Entering Passive Mode (84,145,49,252,195,88).
2019-08-04 02:21:44 8736 3 Command: RETR random_file_432.txt
2019-08-04 02:21:44 8736 3 Error: Disconnected from server: ECONNABORTED - Connection aborted
2019-08-04 02:21:44 8736 3 Error: File transfer failed
2019-08-04 02:21:44 8736 3 Status: Disconnected from server
2019-08-04 02:21:44 8736 2 Response: 226 Transfer complete.
2019-08-04 02:21:44 8736 2 Status: File transfer successful, transferred 6.103 bytes in 1 second
2019-08-04 02:21:44 8736 3 Status: Resolving address of home.zaffran.de
2019-08-04 02:21:44 8736 2 Status: Starting download of /Files/random_file_431.txt
2019-08-04 02:21:44 8736 2 Command: PASV
2019-08-04 02:21:44 8736 2 Response: 227 Entering Passive Mode (84,145,49,252,195,89).
2019-08-04 02:21:44 8736 2 Command: RETR random_file_431.txt
2019-08-04 02:21:44 8736 3 Status: Connecting to 84.145.49.252:21...
2019-08-04 02:21:44 8736 2 Error: Disconnected from server: ECONNABORTED - Connection aborted
2019-08-04 02:21:44 8736 2 Error: File transfer failed
2019-08-04 02:21:44 8736 3 Status: Connection established, waiting for welcome message...
2019-08-04 02:21:44 8736 2 Status: Disconnected from server
2019-08-04 02:21:44 8736 2 Status: Resolving address of home.zaffran.de
2019-08-04 02:21:44 8736 2 Status: Connecting to 84.145.49.252:21...
2019-08-04 02:21:44 8736 3 Response: 220 Microsoft FTP Service
2019-08-04 02:21:44 8736 3 Command: AUTH TLS
2019-08-04 02:21:44 8736 2 Status: Connection established, waiting for welcome message...
2019-08-04 02:21:44 8736 3 Response: 234 AUTH command ok. Expecting TLS Negotiation.
2019-08-04 02:21:44 8736 3 Status: Initializing TLS...
2019-08-04 02:21:44 8736 2 Response: 220 Microsoft FTP Service
2019-08-04 02:21:44 8736 2 Command: AUTH TLS
2019-08-04 02:21:44 8736 2 Response: 234 AUTH command ok. Expecting TLS Negotiation.

这是通过 FileZilla Server 下载时的 FileZilla 客户端日志

2019-08-04 10:57:35 3724 2 Response: 226 Successfully transferred "/Files/random_file_596.txt"
2019-08-04 10:57:35 3724 2 Status: File transfer successful, transferred 1.024 bytes in 1 second
2019-08-04 10:57:35 3724 2 Status: Starting download of /Files/random_file_594.txt
2019-08-04 10:57:35 3724 2 Command: PASV
2019-08-04 10:57:35 3724 3 Response: 150 Opening data channel for file download from server of "/Files/random_file_595.txt"
2019-08-04 10:57:35 3724 2 Response: 227 Entering Passive Mode (84,145,49,252,195,80)
2019-08-04 10:57:35 3724 2 Command: RETR random_file_594.txt
2019-08-04 10:57:35 3724 3 Response: 226 Successfully transferred "/Files/random_file_595.txt"
2019-08-04 10:57:35 3724 3 Status: File transfer successful, transferred 2.048 bytes in 1 second
2019-08-04 10:57:35 3724 3 Status: Starting download of /Files/random_file_593.txt
2019-08-04 10:57:35 3724 3 Command: PASV
2019-08-04 10:57:35 3724 3 Response: 227 Entering Passive Mode (84,145,49,252,195,90)
2019-08-04 10:57:35 3724 3 Command: RETR random_file_593.txt
2019-08-04 10:57:35 3724 2 Error: Disconnected from server: ECONNABORTED - Connection aborted
2019-08-04 10:57:35 3724 2 Error: File transfer failed
2019-08-04 10:57:35 3724 3 Error: Disconnected from server: ECONNABORTED - Connection aborted
2019-08-04 10:57:35 3724 3 Error: File transfer failed
2019-08-04 10:57:35 3724 2 Status: Disconnected from server
2019-08-04 10:57:35 3724 2 Status: Resolving address of home.zaffran.de
2019-08-04 10:57:35 3724 2 Status: Connecting to 84.145.49.252:21...
2019-08-04 10:57:35 3724 2 Status: Connection established, waiting for welcome message...
2019-08-04 10:57:35 3724 3 Status: Disconnected from server
2019-08-04 10:57:35 3724 3 Status: Resolving address of home.zaffran.de
2019-08-04 10:57:35 3724 3 Status: Connecting to 84.145.49.252:21...
2019-08-04 10:57:35 3724 2 Response: 220 Muhahahaaa
2019-08-04 10:57:35 3724 2 Command: AUTH TLS
2019-08-04 10:57:35 3724 3 Status: Connection established, waiting for welcome message...
2019-08-04 10:57:35 3724 2 Response: 234 Using authentication type TLS
2019-08-04 10:57:35 3724 2 Status: Initializing TLS...
2019-08-04 10:57:35 3724 3 Response: 220 Muhahahaaa
2019-08-04 10:57:35 3724 3 Command: AUTH TLS
2019-08-04 10:57:35 3724 3 Response: 234 Using authentication type TLS
2019-08-04 10:57:35 3724 3 Status: Initializing TLS...
2019-08-04 10:57:35 3724 2 Status: Verifying certificate...
2019-08-04 10:57:35 3724 2 Status: TLS connection established.
2019-08-04 10:57:35 3724 2 Command: USER test
2019-08-04 10:57:35 3724 2 Response: 331 Password required for test
2019-08-04 10:57:35 3724 2 Command: PASS *******
2019-08-04 10:57:35 3724 3 Status: Verifying certificate...
2019-08-04 10:57:35 3724 3 Status: TLS connection established.
2019-08-04 10:57:35 3724 3 Command: USER test
2019-08-04 10:57:35 3724 2 Response: 230 Logged on
2019-08-04 10:57:35 3724 2 Command: PBSZ 0
2019-08-04 10:57:35 3724 3 Response: 331 Password required for test
2019-08-04 10:57:35 3724 3 Command: PASS *******
2019-08-04 10:57:35 3724 2 Response: 200 PBSZ=0
2019-08-04 10:57:35 3724 2 Command: PROT P
2019-08-04 10:57:35 3724 3 Response: 230 Logged on
2019-08-04 10:57:35 3724 3 Command: PBSZ 0
2019-08-04 10:57:35 3724 2 Response: 200 Protection level set to P
2019-08-04 10:57:35 3724 2 Status: Logged in
2019-08-04 10:57:35 3724 3 Response: 200 PBSZ=0
2019-08-04 10:57:35 3724 3 Command: PROT P
2019-08-04 10:57:35 3724 2 Status: Starting download of /Files/random_file_592.txt
2019-08-04 10:57:35 3724 2 Command: CWD /Files
2019-08-04 10:57:35 3724 3 Response: 200 Protection level set to P
2019-08-04 10:57:35 3724 3 Status: Logged in
2019-08-04 10:57:35 3724 2 Response: 250 CWD successful. "/Files" is current directory.
2019-08-04 10:57:35 3724 2 Command: TYPE I
2019-08-04 10:57:35 3724 3 Status: Starting download of /Files/random_file_591.txt
2019-08-04 10:57:35 3724 3 Command: CWD /Files
2019-08-04 10:57:35 3724 2 Response: 200 Type set to I
2019-08-04 10:57:35 3724 2 Command: PASV
2019-08-04 10:57:35 3724 3 Response: 250 CWD successful. "/Files" is current directory.
2019-08-04 10:57:35 3724 3 Command: TYPE I
2019-08-04 10:57:35 3724 2 Response: 227 Entering Passive Mode (84,145,49,252,195,81)

使用 WinSCP 通过 FileZilla Server 下载时的样子如下

WinSCP 错误

这是我自己编写的 Delphi FTP 客户端通过 FileZilla Server 下载时的日志

Sent 04.08.2019 11:06:52: RETR random_file_297.txt<EOL>
Recv 04.08.2019 11:06:52: 150 Opening data channel for file download from server of "/Files/random_file_297.txt"<EOL>
Recv 04.08.2019 11:06:52: 226 Successfully transferred "/Files/random_file_297.txt"<EOL>
Sent 04.08.2019 11:06:53: PASV<EOL>
Recv 04.08.2019 11:06:53: 227 Entering Passive Mode (84,145,49,252,195,84)<EOL>
Sent 04.08.2019 11:06:53: RETR random_file_298.txt<EOL>
Recv 04.08.2019 11:06:53: 150 Opening data channel for file download from server of "/Files/random_file_298.txt"<EOL>
Recv 04.08.2019 11:06:53: 226 Successfully transferred "/Files/random_file_298.txt"<EOL>
Sent 04.08.2019 11:06:53: PASV<EOL>
Recv 04.08.2019 11:06:53: 227 Entering Passive Mode (84,145,49,252,195,85)<EOL>
Sent 04.08.2019 11:06:53: RETR random_file_299.txt<EOL>
Recv 04.08.2019 11:06:53: 150 Opening data channel for file download from server of "/Files/random_file_299.txt"<EOL>
Stat Disconnected.
Stat Disconnected.

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