We have recently moved our webserver to a new machine (IIS based) and in the asp.net mvc application I am working on, I have noticed that in the firebug console each request fails twice with a 401 error before finally succeeding on the 3rd try. This did not happen previously and the application seems to be running slightly slower than before, though that could just be my perception.
What might be causing this issue and what might I be able to do in order to avoid it?