The relationship between vsFTPd servers, firewalls, and SELINUX is ambiguous.

I saw some of my friends on the Forum saying:VsFTPdThe server can be started normally, but it cannot be accessed or the user cannot upload files. I think it should be a firewall or SELINUX event. The FTPD server may be protected by the firewall or SELINUX security mechanism. Therefore, you must have the firewall over ftp, and SELINUX over the ftp server;

In Fedora/Redhat/CentOS, you need to set up a firewall, you can turn off the firewall, or in the custom, let the ftp "through" firewall;

[Root @ localhost ~] # System-config-securitylevel-tui

Or run the following command to clear firewall rules (common );

[Root @ localhost beinan] # iptables-F

The explanation of SELINUX server may be difficult for veteran or novice users. We recommend that you use SELINUX or allow the vsFTPd server to skip SELINUX startup; that is to say, the general method of 4.1 and vsFTPd server startup and shutdown is required; this is effective in Fedora/Redhat/CentOS to start vsFTPd server;

Of course, you can also disable SELINUX. The configuration file in/etc/selinux/config is as follows;

/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-SELinux is fully disabled.

SELINUX = Disabled # in this way, The SELINUX server is turned off. restart the system;

# SELINUXTYPE = type of policy in use. Possible values are:

# Targeted-Only targeted network daemons are protected.

# Strict-Full SELinux protection.

SELINUXTYPE = targeted

The article shows that the relationship between vsFTPd servers and firewalls and SELINUX is not bad, but the above method can better handle their relationship!