How to: Open Ssh Port 22 on Linux APF Firewall under CentOS / RHEL

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Q. I’d like to change ssh port from 22 to 2346. I changes the ssh port and reloaded OpenSSH but didn’t get through my firewall. I’m using APF firewall script under cPanel control panel? How do I open port 2346?

A. By default APF configured via /etc/apf/conf.apf file. All you have to do is login as the root and specify port number.

Open port 2346 using APF

Login as the root

Open config file /etc/apf/conf.apf
# vi /etc/apf/conf.apf
Find line that read as follows:
IG_TCP_CPORTS
Add port 2346 (keep all other ports):
IG_TCP_CPORTS="2346,22,25,53,80,443,993,904,...."
Close and save the file. Restart firewall:
# /etc/init.d/apf restart

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

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