We have an iMac on our AD network (DCs are Windows Server 2012). Whenever it boots up we get "Network accounts are unavailable." The mac is joined to our domain. It pulls an IP address from our DHCP server and registers on DNS. The hostname is set to the FQDN, we use the Ethernet connection not Wi-Fi, and the date and time set automatically from the NTP server. What am I missing to get this to work properly?