建立FTP连接时需要注意一些协议连接。
这些连接响应用户的访问，并在当前用户通过身份验证时启用。
在FTP中，如果被动模式未处于活动状态，则会出现此错误。
下面的配置文件是根据vsftpd软件配置的，所有设置均已正确配置，并且没有错误。
主动，被动模式并允许防火墙端口。2000至2500 / TCP
pasv_enable=Yes
pasv_max_port=2500
pasv_min_port=2000
％100固定的Vsftpd配置文件：/etc/vsftpd/vsftpd.conf
# Example config file /etc/vsftpd/vsftpd.conf
#
# The default compiled in settings are fairly paranoid. This sample file
# loosens things up a bit, to make the ftp daemon more usable.
# Please see vsftpd.conf.5 for all compiled in defaults.
#
# READ THIS: This example file is NOT an exhaustive list of vsftpd options.
# Please read the vsftpd.conf.5 manual page to get a full idea of vsftpd's
# capabilities.
#
# Allow anonymous FTP? (Beware - allowed by default if you comment this out).
anonymous_enable=YES
#
# Uncomment this to allow local users to log in.
local_enable=YES
#
# Uncomment this to enable any form of FTP write command.
write_enable=YES
#
# Default umask for local users is 077. You may wish to change this to 022,
# if your users expect that (022 is used by most other ftpd's)
local_umask=022
#
# Uncomment this to allow the anonymous FTP user to upload files. This only
# has an effect if the above global write enable is activated. Also, you will
# obviously need to create a directory writable by the FTP user.
#anon_upload_enable=YES
#
# Uncomment this if you want the anonymous FTP user to be able to create
# new directories.
#anon_mkdir_write_enable=YES
#
# Activate directory messages - messages given to remote users when they
# go into a certain directory.
dirmessage_enable=YES
#
# The target log file can be vsftpd_log_file or xferlog_file.
# This depends on setting xferlog_std_format parameter
xferlog_enable=YES
#
# Make sure PORT transfer connections originate from port 20 (ftp-data).
connect_from_port_20=NO
#
# If you want, you can arrange for uploaded anonymous files to be owned by
# a different user. Note! Using "root" for uploaded files is not
# recommended!
#chown_uploads=YES
#chown_username=whoever
#
# The name of log file when xferlog_enable=YES and xferlog_std_format=YES
# WARNING - changing this filename affects /etc/logrotate.d/vsftpd.log
#xferlog_file=/var/log/xferlog
#
# Switches between logging into vsftpd_log_file and xferlog_file files.
# NO writes to vsftpd_log_file, YES to xferlog_file
xferlog_std_format=YES
pam_service_name=vsftpd
pasv_enable=Yes
pasv_max_port=2500
pasv_min_port=2000
tcp_wrappers=YES
完成所有这些设置后，请记住配置防火墙设置。
- TCP传入：2000至2500和21
- TCP输出：2000至2500和21
请记住，您不能使用ftp：//进行根访问。您必须使用sftp：//来访问根目录。
FTP添加新帐户：
- adduser newftpuser
- passwd newftpuser
默认ftp文件夹：