You'll need to go to the iis manager. The reason for the change when debugging is the following "The IUSR account is by default an account with a lot of restrictions. To get around these restrictions it is necessary to change the Internet Information Server settings for this web site to disallow anonymous access and only permit Integrated Windows authentication. This results in the page and COM components to run under the actual user account that is logged on instead of the ISUR_ account." I haven't had a problem leaving the dev machine set this way (signed in as Administrator) but if you want to go back, you'd just do the opposite and uncheck Integrated Windows authentication