I am very new to SharePoint, having never even used it before. I am setting this up for my wife. I have completed installation successfully as per chapter three (three servers). There are four web applications, including my.contoso.com80 and portal.contoso.com80 (also admin and default) in IIS. I can log into the portal site collection by typing http://portal.contoso.com
but when I attempt to connect to http://my.contoso.com
I get a page not found error. I suspect I have a fundamental misunderstanding somewhere? I have DNS configured as standard by my Server 2012 R2 Domain. Do I need to change something in DNS, if so what?