Redhat5) add and force close ports to the firewall

Article Title: redhat5) add and force close ports on the firewall. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

# Cd/etc/sysconfig

# Ls

# Vi iptables (gedit iptables)

Add

-A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport 3306 (port number, port)-j ACCEPT

Forcibly close the port

# Lsof-I: port (port number)

# Kill-9 port number (this port number is the value displayed after entering lsof-I: port)