Unable to access webmin - server firewall problem?

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http://ubuntuforums.org – Hi, I have a Ubuntu 12.04 server where I've at one point installed webmin on port 10000, but now I can't access it from outside any more. (My browser says "Connection refused".) If I ssh to the server, I can access it from the command line though. So I thought it would have to be a firewall issue. Well, I temporarily did "ufw disable", but I still couldn't access it. It's not a problem on my laptop as I can't access it from elsewhere either. What could be the problem here? Where should I be looking to figure this out? (Hardware)