23.5.1. Daemon Options
The following is a list of directives which control the overall behavior of the vsftpd daemon.
listen — When enabled, vsftpd runs in stand-alone mode. Red Hat Enterprise Linux sets this value to YES. This directive cannot be used in conjunction with the listen_ipv6 directive.
The default value is NO.
listen_ipv6 — When enabled, vsftpd runs in stand-alone mode, but listens only to IPv6 sockets. This directive cannot be used in conjunction with the listen directive.
The default value is NO.
session_support — When enabled, vsftpd attempts to maintain login sessions for each user through Pluggable Authentication Modules (PAM). Refer to Section 43.4, “Pluggable Authentication Modules (PAM)” for more information. If session logging is not necessary, disabling this option allows vsftpd to run with less processes and lower privileges.
The default value is YES.