Install A Firewall To Protect Your Server

If you are concern about server security or your system. Then you mush have to install a firewall(APF) on your system. Now just follow me to how to install or configure it;

1. To install APF SSH into server and login as root.
2. At command prompt type: cd /root/
3. type: wget http://www.rfxnetworks.com/downloads/apf-current.tar.gz
4. type: tar -xvzf apf-current.tar.gz
5. type: rm -f apf-current.tar.gz
6. type: cd apf-0.9.4-6
7. type: sh ./install.sh
8. After APF has been installed, you need to edit the configuration file.
   At command prompt type: cd /etc/apf
   Then type pico -w conf.apf
9. Scroll down and find
   
   USE_DS="0"
   
   change it to
   
   USE_DS="1"
10. Now scroll down and configure the Ports. The following ports are required for CPanel Servers for example - this may not be exactly what you need, but you can change the list to what you do need.
    
    Common ingress (inbound) TCP ports
    IG_TCP_CPORTS="21,22,25,53,80,110,143,465,953,993,995,2082,2083,2084,2086,2087,2095,2096,3306,6666,7786,3000_3500"
    
    Common ingress (inbound) UDP ports
    IG_UDP_CPORTS="53,6277"
    
    Common ICMP (inbound) types
    IG_ICMP_TYPES="3,5,11,0,30,8"
    
    Common egress (outbound) TCP ports
    EG_TCP_CPORTS="21,25,37,53,80,110,113,#123,443,43,873,953,2089,2703,3306"
    
    Common egress (outbound) UDP ports
    EG_UDP_CPORTS="20,21,53,873,953,6277"
    
    Common ICMP (outbound) types
    EG_ICMP_TYPES="all"
    
    Save the changes then exit. To restart APF type: /usr/local/sbin/apf -s
11. Open a new SSH Session to the server
    
    After you are sure everything is working fine, change the DEV option
    
    At command prompt type: cd /etc/apf
    
    At command prompt type: pico -w conf.apf
    
    
    Scroll down and find
    
    DEVM="1"
    
    change it to
    
    DEVM="0"
    
    
    Save changes, exit and then restart firewall,
    
    At command prompt type: /usr/local/sbin/apf -r

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