Copy the line that has port 443, paste it underneath and change the port number to 10000. Save the file, then go back to the Securing Your Server Guide to see how you load your rules into IPTABLES

Cheers,
NAp

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My VPS system:
(Ubuntu 14.04 LTS, Kernel 3.15.4-x86_64, Apache 2.4.7, MariaDB Server 5.5.40, MariaDB Client 5.5.41, PHP 5.5.9, ISPConfig 3.0.5.4p5, Webmin, PureFTP & Quota, phpMyAdmin, postfix, dovecot, amavis, clamav, spamassassin, awstats, fail2ban, Jailkit, bind9, vlogger, webalizer)

If you need to use Webmin , have it listen on localhost only and do some SSH forwarding trickery to access it. Webmin being available on a public IP address is a huge security risk.

-Tim

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'If debugging is the process of removing bugs, then programming must be the process of putting them in.' //Edsger Dijkstra
'Nothing is withheld from us which we have conceived to do.' | 'Do things that have never been done.' //Russell Kirsch

Thanks for the further information Napolean & Tim.