My VPS host recently suspended my service because my site was under a DDoS attack. When they brought me back online, my IP had changed. I can now only view my site by requesting it's IP http://126.96.36.199/, not using the domain name http://gatewaygaming.net.au/.
I've updated my A records and verified that when I enter the domain name my computer is indeed trying to connect to the right server. Weirdly, if I execute "wget http://gatewaygaming.net.au/" on the server itself I can view the page.