We have a dot net nuke web service running on IIS v6.0 . And it uses windows authentication login. Web server used to authenticate using server 2008 dc but now we have upgraded our directory services to 2012r2.
Since then it takes a lot of time for web service to load and many times it doesnt authenticate automatically with the dc.
We disabled anonymous login on IIS and we use a policy to automatic logon only in Intranet.
Is there something that we are missing?