我有一台基于 Linux 的服务器，我用了好几年，就像备份云服务器一样。它与类似客户端配合得很好Windows 7的，Ubuntu和安卓. 但不是Windows 10。
我用于连接的所有程序多年来都与这些客户端运行良好，没有出现问题。
现在我想连接另一台电脑进行在线备份同步返回免费或者免费文件同步在 Windows 10 操作系统上，我遇到了一些 FTP 连接问题。
为了进行测试，我还尝试了使用 FileZilla 的 FTP 连接，甚至在这里，使用 Windows 10，我也发现了同样的问题。
我用作 FTP 服务器的程序是vsftpd，但我也尝试过ProFTPD，出现同样的问题。
以下是一些测试：
Linux 系统上带有 ProFTPD 的 FTP 服务器（使用 vsftpd 可获得非常相似的结果）
----------------测试连接1：
client SyncBackFree on Windows 10 32bit
13/01/2019 03:48:33: SyncBackFree V8.5.97.0
13/01/2019 03:48:33: Windows 10 build 17134
13/01/2019 03:48:33: Resolving host name "82..."
13/01/2019 03:48:33: Connecting to 82... Port: 25
13/01/2019 03:48:33: Connected to 82...**.
13/01/2019 03:48:34: 220 ProFTPD 1.3.5a Server (MaxServerFtp) [192.168.1.8]
13/01/2019 03:48:34: USER odroid
13/01/2019 03:48:34: 331 Password required for odroid
13/01/2019 03:48:34: PASS (hidden)
13/01/2019 03:48:35: 230 User odroid logged in
13/01/2019 03:48:35: SYST
13/01/2019 03:48:35: 215 UNIX Type: L8
13/01/2019 03:48:35: Detected Server Type: UNIX
13/01/2019 03:48:35: RTT: 26.404 ms 13/01/2019 03:48:35: FEAT
13/01/2019 03:48:35: 211-Features:
13/01/2019 03:48:35: SITE MKDIR
13/01/2019 03:49:36: Timeout (60s).
13/01/2019 03:49:36: 3
13/01/2019 03:49:36: Client closed the connection.
---------------测试连接2：
freefilesync on Windows 10 32bit
CURLE_OPERATION_TIMEDOUT: server response timeout
SITE MKDIR [curl_easy_perform]
---------------测试连接3：
filezilla client on Windows 10 32bit
Stato: Connessione a 82...:25...
Stato: Connessione stabilita, in attesa del messaggio di benvenuto...
Stato: Server non sicuro, non supporta FTP su TLS.
Comando: USER odroid
Risposta: 331 Password required for odroid
Comando: PASS **************
Risposta: 230 User odroid logged in
Comando: SYST
Risposta: 215 UNIX Type: L8
Comando: FEAT
Risposta: 211-Features:
Risposta: SITE MKDIR
Errore: Timeout connessione dopo 20 secondi di inattività
Errore: Impossibile collegarsi al server
Stato: In attesa di un nuovo tentativo...
Stato: Connessione a 82...:25...
Stato: Connessione stabilita, in attesa del messaggio di benvenuto...
Risposta: 220 ProFTPD 1.3.5a Server (MaxServerFtp) [192.168.1.8]
Comando: AUTH TLS
Risposta: 500 AUTH not understood
Comando: AUTH SSL
Risposta: 500 AUTH not understood
Stato: Server non sicuro, non supporta FTP su TLS.
Comando: USER odroid
Risposta: 331 Password required for odroid
Comando: PASS **************
Risposta: 230 User odroid logged in
Comando: FEAT
Risposta: 211-Features:
Risposta: SITE MKDIR
Errore: Tentativo di connessione interrotto dall'utente
以下是从 Windows 7 客户端成功连接到 Linux 上的 ProFTPD 服务器的日志示例：
Connecting to 82..., Port 25
220 ProFTPD 1.3.5a Server (MaxServerFtp) [192.168.1.8]
USER odroid
331 Password required for odroid
PASS (hidden)
230 User odroid logged in
FEAT
211-Features:
SITE MKDIR
MFF modify;UNIX.group;UNIX.mode;
REST STREAM
MLST modify*;perm*;size*;type*;unique*;UNIX.group*;UNIX.mode*;UNIX.owner*;
UTF8
EPRT
SITE SYMLINK
EPSV
SITE UTIME
LANG it-IT.UTF-8;it-IT;en-US.UTF-8;en-US*
MDTM
SITE RMDIR
TVFS
SITE COPY
MFMT
SIZE
211 End
OPTS UTF8 ON
200 UTF8 set to on
REST 0
350 Restarting at 0. Send STORE or RETRIEVE to initiate transfer
PWD
257 "/home/odroid" is the current directory
CWD /var/www/test/htdocs
250 CWD command successful
TYPE A
200 Type set to A
PASV
227 Entering Passive Mode (82...,156,201).
MLSD
150 Opening ASCII mode data connection for MLSD
226 Transfer complete
有人能帮帮我吗？
任何帮助我都会非常感激。