we have implemented dot1x to allow multiboot machines connection to seperate domains on seperate vlans. The problem we are having is that occasionally, some machines are slow to authenticate with their required domain. it usually also only occurs during the first bootup of the day. if left, after about 3 or 4 minutes, they have authenticated and will work, however we keep getting tickets about pc's not being able to logon :)
I have check NPS and made sure that the authentication policy is on top of the list.
The only thing I can think of following now is the quiet-time period on the ethernet ports, possibly cutting that back from 60 to 10.
Our switches are mainly all 3560's.
All help will be appreciated!