Windows authentication form. Why

Hi guys.

I have a Windows 2003 server with a site containing asp pages. In one of them I have a link to a site containing aspx pages. Sometimes, when I click on it, it show the Windows authentication form to access to the server. Why? I've have to edit some settings on IIS security?

ThanksEnable Integrated Windows Authentication in IIS.

IIS -> Web Sites -> Virtual Directory of your asp.net application -> Properties -> Directory Security -> Anonymous access and authentication control -> Edit -> Check Integrated Windows Authentication

HTH
HoraShadow
Chances are that if it isn't your application, whoever created it had Windows Authentication in mind as a security measure, so you want to find out whether it ought to be there or not before you actually remove it.