Windows Authentication Help

[beefeater267]

Hey,

I have an intranet web app that I only allow authenticated users in.

How come if I specify the URL:

http://intranet

it lets me in seamlessly, however, if i specify the full address:

http://intranet.mydomain.net

Note that I am logged into the domain both times from the same machine

it still prompts me for the login / password... then lets me in. Is there any way around this?

thanks