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Like kirukan said above, Webmin is listening on port 10000..
HTTP and HTTPS are a transfer protocol and just because they default to port 80 and 443 doesn't mean that HTTP(S) connections can't be made on different ports..
Your firewall allows just those two ports (as instructed) but not 10000 (used by default by Webmin --btw, you should change it)..
/etc/services has a list of common usage for ports. http being 80, https being 443, webmin being 10000 in it's list. tcpdump might help check to see what is / is not getting through.
Like kirukan said above, Webmin is listening on port 10000..
HTTP and HTTPS are a transfer protocol and just because they default to port 80 and 443 doesn't mean that HTTP(S) connections can't be made on different ports..
Your firewall allows just those two ports (as instructed) but not 10000 (used by default by Webmin --btw, you should change it)..
Your line is just fine.. Mine was missing an -m state before --state for it to work
And yes, the iptables-save line should work if that's the correct path (sorry, haven't touched CentOS in a while).. If you have an IPv6 connection, do this for ip6tables too, sure..
About ports.. anything above 1024 should be save to use.. just remember to also modify your firewall rules.. Pick something that you'll find easy to remember.. The ideea is to give a harder time to bots or other malicious software that try and exploit webmin on it's default port...
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