Your web browser will prompt for a username and password when attempting to access a page in the Web Tracks /Reports folder.
This behavior can happen if the following is true:
1. You have changed the root of your site in IIS from http://YourServerName/WebTracks to http://YourServerName
2. SQL Server 2008 is installed with reporting Services
When the above is true SQL Server Reporting Services intercepts requests to the http://SiteRoot/Reports folder.
To solve this problem you must change the default URL that SQL Reporting Services uses. To do this perform the following steps:
1. Open SQL Reporting Service Configuration Manager
2. In the left hand menu select 'Report Manager URL'
3. Change the URL folder from 'Reports' to 'SqlReports'
4. Save the configuration changes