web site blank page or white page

I have windows 2012, visual studio 2012 and IIS 8 installed on the web server. I've added a web site and configured it. When I am running it in the local host mode the default page shows with no problem. When I am trying to run it as a web site with out local host it shows a blank page or white page? Any ideas why it happens?
LeopoledAsked:
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David Johnson, CD, MVPOwnerCommented:
so http://localhost shows the default page but http://servername shows a blank page?

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