I have an intranet ASP.NET 2.0 web app running on a Win 2003 SP2 server running IIS 6.0 that gives intermittent and, as yet, un-reproduceable username/password prompts for some of our users. I'm using authentication mode="Windows" in my ASP.NET app and Integrated Windows authentication in IIS, with "Enable anonymous access" unchecked. This should allow users on the local network to access the application without having to log in, by virtue of already being logged into the Windows local network. And this is exactly how it behaves most of the time. I use the application on and off throughout the day and have never experienced the problem on my own PC. I am based at our company's head office, where the servers and domain controllers are also based. Most users are based off-site but logged into the domain via an MPLS cloud lease line. Several users have reported seeing a username/password pop-up prompt during the course of their use of the application, b ...
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