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Whenever I install vsftpd on centos, I only setup the jail environment for the users and rest is default configuration of vsftpd. I create user and try to connect with filezila ftp client but I could not connect with passive mode. I always change the "transfer settings" to active mode to successfully connect to the ftp server otherwise I get

 Error: Failed to retrieve directory listing

So is there a way to change any directive in vsftp.conf file and we can connect with passive mode to the server?

Update: Thanks to all working well with the answers given.

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4 Answers

up vote 19 down vote accepted

To configure passive mode for vsftpd you need to set some parameters in vsftpd.conf.

pasv_enable=Yes
pasv_max_port=10100
pasv_min_port=10090

This enables passive mode and restricts it to using the ten ports for data connections. This is useful as you need to open these ports on your firewall.

iptables -I INPUT -p tcp --destination-port 10090:10100 -j ACCEPT

If after testing this all works then save the state of your firewall with

service iptables save

which will update the /etc/sysconfig/iptables file.

What happens when you make a connection

  • Your client makes a connection to the vsftpd server on port 21.

  • The sever responds to the client telling it which port to connect to from the range specified above.

  • The client makes a data connection on the specified port and the session continues.

There is a great explanation of the different ftp modes here.

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To enable passive mode, set the following configuration options in your vsftp.conf:

pasv_enable=YES
pasv_min_port=41361
pasv_max_port=65534
pasv_address=xxx.xxx.xxx.xxx

You can of course change the start and end port, and should replace the xxx's with the public IP of your server.

In addition, you should open the passive mode port range in your firewall. On centos, you can load the ip_conntrack_ftp module to handle ftp connections in your firewall. Edit /etc/sysconfig/iptables-config and add ip_conntrack_ftp to the IPTABLES_MODULES option. Afterwards restart iptables:

/sbin/service iptables restart
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Beside the pasv_enable=YES, specify a port range in which VSFTP will run PASV mode:

pasv_min_port=50000
pasv_max_port=50999
port_enable=YES

Don't forget to configure iptables allows packet transmission on these ports:

iptables -I INPUT -p tcp --dport 50000:50999 -j ACCEPT
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On a standard CentOS system there is a blanket DROP that causes rules added with iptables -A INPUT ... to be ignored –  Iain Aug 25 '12 at 16:59
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Usually, it's not the ftp server, vsftpd, but the firewall like iptable that prevents passive mode from being used (blocking tcp connection needed for data transfert).

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