FTP Active Passive Mode configuration confusion causes unable to log on

Phenomenon: User feedback FTP can not login, ssh Landing is normal, when landing FTP prompts error: Connection accept sent data confirmation failed, new FTP site also prompted error: Server-side interface exception, FTP site add failed.

1. Solution 1

Analysis Process and solution: We look at the machine after the confirmation is/etc/vsftpd/vsftpd.conf, user active mode and passive mode Setup error caused.

In the/etc/vsftpd/vsftpd.conf file, the user's source file is like this:

Listen=yes

Anonymous_enable=no

Use_localtime=yes

Local_enable=yes

Write_enable=yes

local_umask=022

Dirmessage_enable=no

Xferlog_enable=yes

Connect_from_port_20=yes

Xferlog_file=/var/log/vsftpd.log

Xferlog_std_format=no

idle_session_timeout=180

data_connection_timeout=120

Ascii_upload_enable=yes

Ascii_download_enable=yes

Ftpd_banner=welcome to www.net.cn FTP service.

Chroot_list_enable=yes

Chroot_list_file=/etc/ftpchroot

Ls_recurse_enable=yes

Pam_service_name=vsftpd

Userlist_enable=yes

Log_ftp_protocol=yes

Max_per_ip=3

Pasv_enable=yes

pasv_max_port=30000

pasv_min_port=30000

To set an error cause analysis:

In the above/etc/vsftpd/vsftpd.conf file Connect_from_port_20=yes is the meaning of enabling the default 20 port listener when active mode is turned on

Pasv_enable=yes

pasv_max_port=30000

pasv_min_port=30000 This is set in passive mode

The passive mode is correctly set to:

Pasv_enable=yes Open Passive Mode

pasv_min_port=%number% Passive mode lowest port

pasv_max_port=%number% Passive mode highest port

The lowest and highest ports in the user's passive mode are 30000, and all pasv_max_port=30000 pasv_min_port=30000 are misconfigured.

2. Solution:

1) We will connect_from_port_20=yes the comment of the active mode of this statement out

2) Modify Passive mode configuration

Pasv_enable=yes

pasv_max_port=30000

pasv_min_port=30000

To

Pasv_enable=yes

pasv_max_port=30000

pasv_min_port=25000

3 Restart Vsftp can be logged in.

3. For FTP active mode and passive mode settings can refer to http://zhidao.baidu.com/question/279862735.html