Has a similar command worked for you in the past?
No, this is my first time trying.
While it is impossible to be sure without knowing more about your firewall, I'm fairly certain that is not what you want. You'll probably have more luck with something like
That didn't work either. Not until my friend edited /etc/sysconfig/ iptables manually and restarted the service did it work.
Are you not supposed to edit /etc/sysconfig/iptables manually? A comment at the top of the file says it's not recommended.
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