unlike simple hostname fully qualified url invokes AD auth.

unlike simple hostname fully qualified url invokes AD auth.

When I provide the host name as the URL to my ServiceDesk Plus, I am already authenticated to the server in our office net here as I am logged into our Act Dir, therefore I do not get an Act Dir authentication prompt. When I instead specify a fully qualified domain URL, I get an Act Dir auth prompt.
Can you point me in a right direction to assure my users do NOT get an Act Dir auth prompt for fully qualified domain URLs?

                    New to ADSelfService Plus?