该错误是由iptables的配置引起的，临时的解决方法是执行如下命令：
[root@localhost soft]# modprobe ip_nat_ftp
再次登陆列表正常啦！
但当你重新启动服务器则iptables规则失效，又会出现相同的情况，所以我们需要修改/etc/sysconfig/iptables-config文件，
[root@localhost soft]# vi /etc/sysconfig/iptables-config
# Load additional iptables modules (nat helpers)
# Default: -none-
# Space separated list of nat helpers (e.g. 'ip_nat_ftp ip_nat_irc'), which
# are loaded after the firewall rules are applied. Options for the helpers are
# stored in /etc/modprobe.conf.
IPTABLES_MODULES=""
# Unload modules on restart and stop
# Value: yes|no, default: yes
# This option has to be 'yes' to get to a sane state for a firewall
# restart or stop. Only set to 'no' if there are problems unloading netfilter
# modules.
IPTABLES_MODULES_UNLOAD="yes"
......
IPTABLES_MODULES_UNLOAD="yes"的意义：每次iptables停止或者重启都会Unload modules
IPTABLES_MODULES=""的意义：每次防火墙规则应用以后加载的模块
我们需要把
IPTABLES_MODULES=""
修改为：
IPTABLES_MODULES="ip_nat_ftp"
这样重启服务器之后就不必再每次都执行mobprobe啦。