我已经在 Ubuntu 18.04 中安装了 ProFTPd
它已经工作了好几个月了。现在由于某些原因，它不再与我的 Go Client 配合使用。
如果我想连接 Filezilla，只要我以主动模式连接它就可以工作。
这很奇怪，因为在 AWS 中，我的 Go 客户端正在运行，运行在我的 Kubernetes 集群中，但这不是本地的。
我在本地也遇到了这个问题，我localhost通过更改解决了它127.0.0.1，但我不确定它为什么起作用。
但是我尝试对远程服务器进行同样的事情，通过 IP 更改 ftp.domain.com，但没有效果。
AWS 安全组对所有端口、所有 IP 开放，并且 ufw 处于非活动状态，因此不应该存在防火墙问题。
另外，我没有使用 TLS，而是使用普通的 FTP。我的所有文件都已加密。
这是proftpd.conf配置文件
# /etc/proftpd/proftpd.conf -- This is a basic ProFTPD configuration file.
# To really apply changes, reload proftpd after modifications, if
# it runs in daemon mode. It is not required in inetd/xinetd mode.
#
# Includes DSO modules
Include /etc/proftpd/modules.conf
# Set off to disable IPv6 support which is annoying on IPv4 only boxes.
UseIPv6 on
# If set on you can experience a longer connection delay in many cases.
IdentLookups off
ServerName "FTP"
# Set to inetd only if you would run proftpd by inetd/xinetd.
# Read README.Debian for more information on proper configuration.
ServerType standalone
DeferWelcome off
MultilineRFC2228 on
DefaultServer on
ShowSymlinks on
TimeoutNoTransfer 600
TimeoutStalled 600
TimeoutIdle 1200
DisplayLogin welcome.msg
DisplayChdir .message true
ListOptions "-l"
DenyFilter \*.*/
# Use this to jail all users in their homes
DefaultRoot ~
# Users require a valid shell listed in /etc/shells to login.
# Use this directive to release that constrain.
RequireValidShell off
# Port 21 is the standard FTP port.
Port 21
# In some cases you have to specify passive ports range to by-pass
# firewall limitations. Ephemeral ports can be used for that, but
# feel free to use a more narrow range.
PassivePorts 49152 65534
# If your host was NATted, this option is useful in order to
# allow passive tranfers to work. You have to use your public
# address and opening the passive ports used on your firewall as well.
# MasqueradeAddress 1.2.3.4
# This is useful for masquerading address with dynamic IPs:
# refresh any configured MasqueradeAddress directives every 8 hours
<IfModule mod_dynmasq.c>
# DynMasqRefresh 28800
</IfModule>
# To prevent DoS attacks, set the maximum number of child processes
# to 30. If you need to allow more than 30 concurrent connections
# at once, simply increase this value. Note that this ONLY works
# in standalone mode, in inetd mode you should use an inetd server
# that allows you to limit maximum number of processes per service
# (such as xinetd)
MaxInstances 30
# Set the user and group that the server normally runs at.
User proftpd
Group nogroup
# Umask 022 is a good standard umask to prevent new files and dirs
# (second parm) from being group and world writable.
Umask 022 022
# Normally, we want files to be overwriteable.
AllowOverwrite on
# Uncomment this if you are using NIS or LDAP via NSS to retrieve passwords:
# PersistentPasswd off
# This is required to use both PAM-based authentication and local passwords
# AuthOrder mod_auth_pam.c* mod_auth_unix.c
# Be warned: use of this directive impacts CPU average load!
# Uncomment this if you like to see progress and transfer rate with ftpwho
# in downloads. That is not needed for uploads rates.
#
# UseSendFile off
TransferLog /var/log/proftpd/xferlog
SystemLog /var/log/proftpd/proftpd.log
# Logging onto /var/log/lastlog is enabled but set to off by default
#UseLastlog on
# In order to keep log file dates consistent after chroot, use timezone info
# from /etc/localtime. If this is not set, and proftpd is configured to
# chroot (e.g. DefaultRoot or <Anonymous>), it will use the non-daylight
# savings timezone regardless of whether DST is in effect.
#SetEnv TZ :/etc/localtime
<IfModule mod_quotatab.c>
QuotaEngine off
</IfModule>
<IfModule mod_ratio.c>
Ratios off
</IfModule>
# Delay engine reduces impact of the so-called Timing Attack described in
# http://www.securityfocus.com/bid/11430/discuss
# It is on by default.
<IfModule mod_delay.c>
DelayEngine on
</IfModule>
<IfModule mod_ctrls.c>
ControlsEngine off
ControlsMaxClients 2
ControlsLog /var/log/proftpd/controls.log
ControlsInterval 5
ControlsSocket /var/run/proftpd/proftpd.sock
</IfModule>
<IfModule mod_ctrls_admin.c>
AdminControlsEngine off
</IfModule>
#
# Alternative authentication frameworks
#
#Include /etc/proftpd/ldap.conf
#Include /etc/proftpd/sql.conf
#
# This is used for FTPS connections
#
#Include /etc/proftpd/tls.conf
#
# Useful to keep VirtualHost/VirtualRoot directives separated
#
#Include /etc/proftpd/virtuals.conf
# A basic anonymous configuration, no upload directories.
# <Anonymous ~ftp>
# User ftp
# Group nogroup
# # We want clients to be able to login with "anonymous" as well as "ftp"
# UserAlias anonymous ftp
# # Cosmetic changes, all files belongs to ftp user
# DirFakeUser on ftp
# DirFakeGroup on ftp
#
# RequireValidShell off
#
# # Limit the maximum number of anonymous logins
# MaxClients 10
#
# # We want 'welcome.msg' displayed at login, and '.message' displayed
# # in each newly chdired directory.
# DisplayLogin welcome.msg
# DisplayChdir .message
#
# # Limit WRITE everywhere in the anonymous chroot
# <Directory *>
# <Limit WRITE>
# DenyAll
# </Limit>
# </Directory>
#
# # Uncomment this if you're brave.
# # <Directory incoming>
# # # Umask 022 is a good standard umask to prevent new files and dirs
# # # (second parm) from being group and world writable.
# # Umask 022 022
# # <Limit READ WRITE>
# # DenyAll
# # </Limit>
# # <Limit STOR>
# # AllowAll
# # </Limit>
# # </Directory>
#
# </Anonymous>
# Include other custom configuration files
Include /etc/proftpd/conf.d/
另外，我可以检查netstat -nlpute | grep 21FTP 是否正在监听端口 21：
tcp6 0 0 :::21 :::* LISTEN 113 46129898 28696/proftpd: (acc
我尝试加载模块：
sudo /sbin/modprobe ip_conntrack_ftp
按照一些页面的建议，重新启动了 ftp，但没有效果
更新：
切换到4G连接后，我的问题发生了变化：
Status: Resolving address of localhost
Status: Connecting to [::1]:21...
Status: Connection established, waiting for welcome message...
Status: Server does not support non-ASCII characters.
Status: Logged in
Status: Retrieving directory listing...
Status: Directory listing of "/" successful
Status: Disconnected from server
Status: Resolving address of ftp.xxxx.fr
Status: Connecting to xxxxxxx:21...
Status: Connection established, waiting for welcome message...
Status: Logged in
Status: Retrieving directory listing...
Command: PWD
Response: 257 "/" is the current directory
Command: TYPE I
Response: 200 Type set to I
Command: PASV
Error: Could not read from socket: ECONNRESET - Connection reset by peer
Error: Disconnected from server
Error: Failed to retrieve directory listing
Status: Disconnected from server
Status: Resolving address of ftp.xxx.fr
Status: Connecting to xxxxxx:21...
Status: Connection established, waiting for welcome message...
Status: Logged in
Status: Retrieving directory listing...
Command: PWD
Response: 257 "/" is the current directory
Command: TYPE I
Response: 200 Type set to I
Command: PASV
Error: Could not read from socket: ECONNRESET - Connection reset by peer
Error: Disconnected from server
Error: Failed to retrieve directory listing
当我选择主动传输模式时它仍然有效。
当我做 ：
proftpd -vv
我得到：
2020-08-21 06:48:41,796 ip-172-31-45-72 proftpd[29875]: warning: unknown/unsupported LANG environment variable 'en_US.UTF-8', ignoring
2020-08-21 06:48:41,799 ip-172-31-45-72 proftpd[29875]: mod_ctrls/0.9.5: unable to open ControlsLog '/var/log/proftpd/controls.log': Permission denied
2020-08-21 06:48:41,799 ip-172-31-45-72 proftpd[29875]: fatal: ControlsLog: unable to open '/var/log/proftpd/controls.log': No such file or directory on line 122 of '/etc/proftpd/proftpd.conf'
我认为他们都无法解决我的问题。
最后，检查日志，重置连接后，我得到：
2020-08-21 06:55:57,273 ip-172-31-45-72 proftpd[29943] ip-172-31-45-72.eu-west-3.compute.internal (my ip.rev.sfr.net[my ip]): FTP session opened.
2020-08-21 06:55:57,429 ip-172-31-45-72 proftpd[29943] ip-172-31-45-72.eu-west-3.compute.internal (my ip.rev.sfr.net[my ip]): USER sgsource: Login successful.
2020-08-21 06:55:57,613 ip-172-31-45-72 proftpd[29943] ip-172-31-45-72.eu-west-3.compute.internal (my ip.rev.sfr.net[93.23.197.105]): FTP session closed.
2020-08-21 06:55:57,816 ip-172-31-45-72 proftpd[29959] ip-172-31-45-72.eu-west-3.compute.internal (my ip.rev.sfr.net[my ip]): FTP session opened.
2020-08-21 06:55:57,965 ip-172-31-45-72 proftpd[29959] ip-172-31-45-72.eu-west-3.compute.internal (my ip.rev.sfr.net[my ip]): USER sgsource: Login successful.
2020-08-21 06:55:58,190 ip-172-31-45-72 proftpd[29959] ip-172-31-45-72.eu-west-3.compute.internal (my ip.rev.sfr.net[my ip]): FTP session closed.
当我通过 SSH 连接到我的 ftp 服务器，并使用以下命令在 localhost 中连接 ftp 时：
ftp localhost
我输入我的登录名/密码，然后：
quote PASV
ls
我可以看到我的文件列表，所以它起作用了。
我仍然不明白发生了什么以及我应该怎么做才能解决它。
任何帮助将不胜感激 ！