linux关闭防火墙与SELinux
 iptables涉及端口拦截
SELinux涉及应用程序无法启动

[root@mail ~]# service iptables stop
iptables：清除防火墙规则：                                 [确定]
iptables：将链设置为政策 ACCEPT：filter                    [确定]
iptables：正在卸载模块：                                   [确定]
[root@mail ~]# service ip6tables stop
ip6tables：清除防火墙规则：                                [确定]
ip6tables：将 chains 设置为 ACCEPT 策略：filter            [确定]
：正在卸载模块：                                           [确定]
[root@mail ~]# chkconfig iptables off
[root@mail ~]# chkconfig ip6tables off
[root@mail ~]# vi /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of these two values:
#     targeted - Targeted processes are protected,
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted
[root@mail ~]# reboot