linux - Closing a port on CentOS6

Question

Recently we had a need to open a port on our CentOS6 system. We followed the instructions given on an old stackoverflow post i.e.

iptables -A INPUT -m state --state NEW -p tcp --dport ?port-num? -j ACCEPT

/etc/init.d/iptables restart

These instructions worked quite well. However, now we want to close the port. Naturally we tried

iptables -A INPUT -m state --state NEW -p tcp --dport ?port-num? -j DROP

/etc/init.d/iptables restart

However, we are finding that the port is still open. As per the man page of iptables (e.g. here) DROP should have done the trick.

question from:https://stackoverflow.com/questions/66046990/closing-a-port-on-centos6

Answer 1

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