Problems Navigating to My Own Server from My Server

[TANKERx]

Hi,

I'm not sure if this is an IIS or SSRS issue, but I suspect it's IIS;

I have a server called SQL-01 and this machine hosts a SQL server with SSRS. I have also edited the HOSTS file so that mydomain.com points back to the server (I have tried this on the server's IP address and with 127.0.0.1)

In IE, I can navigate to

http://localhosts/reports

and when I type in a username and password, all works well. However, when I type in

http://mydomain/reports,

it asks for a username and password but nothing is accepted. I have tried a combination of domain/username and computer/username to no avail.

The reason I suspect IIS and not SSRS is that I get this problem before the SSRS service has even started if I go straight to

http://mydomain/reports.

Is there anything I should be doing to get this to work?

I'd appreciate any help you can offer.

Thank you all in advance.