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
多年来，我用于连接的所有程序都运行良好，没有出现任何问题。现在
我想在 Windows 10 操作系统上使用 SyncBackFree 或 freefilesync 连接另一台计算机进行在线备份，但 FTP 连接出现了问题。
为了进行测试，我还尝试使用 filezilla 进行 ftp 连接，即使在 Windows 10 上我也发现了同样的问题。
我使用的程序（如服务器 FTP）是vsftpd，但我也尝试过FTPD软件有同样的问题。
这里有一些测试：
Linux系统上的FTP服务器ProFTPD（与vsftpd的结果非常相似）
----------------测试连接1：
Windows 10 32位上的客户端SyncBackFree
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：
Windows 10 32位上的freefilesync
CURLE_OPERATION_TIMEDOUT: server response timeout
SITE MKDIR [curl_easy_perform]
---------------测试连接3：
Windows 10 32位上的filezilla客户端
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
下面是从客户端 win7 到服务器 ProFTPD linux 的连接成功日志示例：
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。
达维德