You receive this prompt when running your application:
Enter username and password for...
When you run an application in the FireFox web browser, you may be prompted to enter the user name and password. This occurs when your application is configured to run under the user connecting to the application (no anonymous access), a typical situation in development environments, and your browser not pass Windows authentication credentials to the web server. Browsers such as Firefox do not pass Windows authentication credentials to the web server; Microsoft Internet Explorer does pass these credentials, however. This behavior is not related to Iron Speed Designer or applications built with Iron Speed Designer.
Enter the user name and password you use to login to the machine running your application.
Part VII: Troubleshooting Applications