Haven't been able to find the answer for this one anywhere yet...
I have recently been migrating all of our sites to a new Windows 2012 R2 w/ IIS 8.5 server.
Any site that used Windows authentication without issue on the old Win2k3 II6 server is now popping a credentials box on the new server. It should automatically pick up the credentials of anyone on our domain.
So far the only fix I have found is adding the website to trusted sites.
Help?