Custom domain redirects in amazonaws.com

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http://serverfault.com – I purchased an amazon ec2 instance, where I configured a webserver. Then I purchased Route53 to handle dns, where I set my custom domain to point on the Elastic IP. The fact is that when typing my domain name the server web answers using the AmazonAws.com domain!! I'm running varnish in front of apache2. How can I fix that? (HowTos)