IIS Configuration - Access Denied

I'm having a problem getting my web site up and running.  Executing it on th
e
server using localhost the site comes up fine.  If I try to use the URL
either from the server or an external machine I get the SSL ceritifacte and
then an "Access Denied" message.  If I disable SSL I still get the "Access
Denied" message, so I don't think that's where the problem lies.  I have ISS
configured for anonymous access.  My site was developed with ASP.NET.  Is
there a checklist somewhere to troubleshoot this type of problem?  Any
suggestions would be appreciated.

Thank you,

Gary