Warning: You must update your firewall settings to accept new port. $ sudo firewall-cmd -permanent -zone=public -add-port=2222/tcp To open the new port run the following commands on Fedora/CentOS/ RHEL/Oracle Linux using FirewallD Pass log on $ext_if proto tcp to any port 2222 keep state The syntax for pf firewall is as follows (FreeBSD/OpenBSD/NetBSD Unix) in your pf.conf: $ sudo /sbin/iptables -A INPUT -m state -state NEW -m tcp -p tcp -dport 2222 -j ACCEPT The syntax for the iptables command is as follows:

See how to open TCP port 22 using the ufw for more info. If you are using UFW on a Ubuntu/Debian Linux, type: # semanage port -a -t ssh_port_t -p tcp 2222 Updating your firewall to accept the ssh port 2222 in Linux You must type the following command to change port to 2222:

Viewing or choosing a new SSH port number in Linux A note about SELinux users Use the cat command/ grep command/ egrep command to see internet network services list:Įgrep -w '(80|443|110|53)/tcp' /etc/services Here is a common list of privileged services and designated as well-known ports: Common TCP or UDP ports Table 01 – Common Unix and Linux ports from the /etc/services Port Hence, I recommend choosing port numbers between 105. Please note that port numbers 0-1023 are reserved for various system services. I added the 2>/dev/null at the end to hide find command permission denied messages warning/spam. The find command try to locate sshd server config file named sshd_config. Locate sshd_config file by typing the following command

Restart the sshd service to change the ssh port in Linux or Unix machine.SELinux user adjust the port permission.

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