Virtual Server R2 authentication prompt and error
The last two times that I have installed Virtual Server R2, it has been SP1 Beta 1 and then Beta 2. Each time the install was simple, but when I first attempted to navigate to the Admin homepage, I recieved a login prompt. Very frustrating, to say the least. Each time I have resolved it by Googling and it was a pain to find the (simple) answer. The answer is easy: Add the address of the panel to your "Intranet Zone" in IE. This is an IE issue, not a Virtual Server issue from what I can tell.
Here is the link that helped me out and that explains the problem. I am putting this blog out here so that when I look for it again, it will be right here waiting for me.