Web.config Authorization Roles with Local Groups with Domain Groups in them

I am "Domain\MyDomainUserName"
If I do this:

<configuration> <system.web> <authorization> <allow users="Domain\MyDomainUserName" /> <deny users="*" /> </authorization> </system.web> </configuration>
I can access the website I've created on my local machine in debug mode; and with my domain account as a local administrator, if I do this:

<configuration> <system.web> <authorization> <allow roles="BUILTIN\Administrators" /> <deny users="*" /> </authorization> </system.web> </configuration>I can still access the website; and with my domain account in a Domain Group named "Domain\DomainLocalSecurityGroup", if I do this:

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