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How to configure Zimbra with CSF

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CSF is one of the best opensource firewalls that using in most of the hosting servers like cPanel and Directadmin . Also it is one of the best firewall for installing Zimbra Mail server. This documentation will help you How to configure Zimbra with CSF.

We have developed an SPI iptables firewall that is straight-forward, easy and
flexible to configure and secure with extra checks to ensure smooth operation.

csf can be used on any (supported – see the website) generic Linux OS.

The csf installation includes preconfigured configurations and control panel
UI’s for cPanel, DirectAdmin and Webmin

Directory structure:

  • /etc/csf/ – configuration files
  • /var/lib/csf/ – temporary data files
  • /usr/local/csf/bin/ – scripts
  • /usr/local/csf/lib/ – perl modules and static data
  • /usr/local/csf/tpl/ – email alert templates

Before starting the installation, you may need to read the documentation available on http://wiki.zimbra.com/wiki/Ports, this will help you to get a quick understanding of ports that required to open in a Zimbra server.

Install CSF :

You can download CSF from http://configserver.com/cp/csf.html and install it . After that open the CSF configuration and enable the following ports,

TCP_IN = "22,25,53,80,110,143,443,465,587,993,995,7071"
TCP_OUT = "22,25,53,80,110,113,443,465,587,993,995,7071"

Now you need to open the file /etc/csf/csf.pignore and add the following zimbra packages paths.

This will help to white list these binaries in CSF

Now you can start the CSF as follows and test it.

# /etc/init.d/csf start

You may need to test the mail server and its functionalities . After that you can disable the testing mode in csf.conf and reload CSF. You can also perform other generic CSF tweaks after that.

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