Heroku hosted website using zerigo dns not loading for url without leading www

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http://serverfault.com – I've seen many questions similar to this but nothing specific to heroku and none of them are working for me. I am in China trying to access my website that I host on heroku. If I use a VPN and type the domain without www (ie. mywebsite.com) then I can access it. However, if I am NOT behind a VPN then the same URL doesn't work. In summary: with VPN www.mywebsite.com - works mywebsite.com - works without VPN www.mywebsite.com - works mywebsite.com - does NOT work! Any idea how I can fix this so that it works even if I'm not behind a VPN? (HowTos)