Why you'd be using this on a publically accessible network is beyond me. If you don't want people to access the web interface on that public network then you'd have to block the application. Web interfaces will generally be on 80 or 443 or a variant of that such as 8080, 8443, 4443 and you will want to block that. I know what I'm talking about and don't care if you don't like that answer. A DLNA server shouldn't be run on a public network such as a hotel network. If you don't like the answer go read the documentation and best practices for DLNA it will probably tell you the same thing.