I have a Windows 10 system that was upgraded from Home to Pro. It is now running anniversary edition. I have successfully joined the system to a Windows 2008 R2 domain. after the reboot, When I attempt to login with an AD (domain admin or user) account, I always get the message "the user name or password is incorrect". I am able to login to other Windows 7 systems with these accounts and they work fine. I have verified that the DHCP address points to the correct servers for DNS. If I log using a local account, I can browse the network, select a server share, and then connect to it AFTER I enter in an AD account with the correct permissions. I removed the system from the domain and re-added it, the same issue continues. I have 4 new systems doing this. What am I missing?