Am 16.07.2020 um 17:48 schrieb Kaushal Shriyan: > Hi, > > I am running CentOS Linux release 8.2.2004 (Core) on a remote server. I am > running the below iptables command to allow SSH port 22 from a specific > source IP 219.91.200.59 > > iptables -A INPUT -m tcp -p tcp -s 219.91.200.59 --dport 22 -j ACCEPT >> service iptables save > > > The above iptables ruleset is not working and I am still able to connect > from the internet to SSH port 22. I look forward to hearing from you and > thanks in advance. > > Best Regards, > > Kaushal Please consult the documentation to understand how to use the firewall on CentOS 8: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/securing_networks/index#using-and-configuring-firewalld_securing-networks In short: you are doing it wrong in multiple dimensions. Alexander