Sub Domain Setup fails

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http://forums.cpanel.net – I want to add the Sub Domain to a working Domain so it becomes test.domain.co.uk. From Cpanel, I have set up the Sub Domain and it created the folder /public_html/test I set up an DNS A record for test.domain.co.uk as well, although I am not sure if this is needed? Viewing "http://www.domain.co.uk/test" works, but "test.domain.co.uk" results in the error "Firefox can't find the server at test.domain.co.uk." From within WHM, Main >> Server Configuration >> Tweak Settings, I have the following settings: Allow users to park subdomains of the (HowTos)