connecting hostname to server

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http://serverfault.com – I have an ubuntu server installed on my server with virtualmin webmin. everything is good the server itself....I can connect to localhost and the virtualmin manager (http://localhost:10000). the problem is, I can't connect to it from a client computer. For example when I enter the IP address of the server, its shows me 403 forbidden error (sometimes its shows the homepage right)...but the virtualmin manager could not open... if my website is example.com with this ip: xxx.xxx.xxx.xxx, i can't connect to example.com:10000 or xxx.xxx.xxx.xxx:10000 what should I do? (HowTos)