Hi all; simple question and I found in Google but unable to block my ip from my host. I used following command and got nothing: Code: [root@chicabwh ~]# iptables -D INPUT -s 18.104.22.168 -j DROP iptables: Bad rule (does a matching rule exist in that chain?). I did 'service iptables save' as well. And some more ip addresses I like to unblock, do you have any script?. Any help is really appreciate. Thanks.