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On Centos 6 machine, how can I block port 8888 from being accessed except by localhost/127.0.0.1 only using iptables? Actually, I have another port that I want to listen on 8000 instead of 8888.

This command blocks access to localhost:8888

iptables -I INPUT -p tcp --dport 8888 -j DROP

I don't want access to 1.2.3.4:8888 but only to localhost:8888

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If you mean by 1.2.3.4 any other IP different than localhost, you can use the following (if I understood you well):

iptables -I OUTPUT -p tcp --dport 8888 -j DROP
iptables -I OUTPUT -s 127.0.0.1 -p tcp --dport 8888 -j ACCEPT

The first drop all outgoing traffic to TCP/8888 and the second rule accept it when it originates from localhost.

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