The UOFI Active Directory domain controller udc04.ad.uillinois.edu will be undergoing a hardware upgrade. It will be removed from service at 10:00 PM on 9/17. It will continue to be reachable but will not advertise for new connections from clients. During this time, clients will re-establish connections with other domain controllers. At 10:00 PM on 9/18 it will be powered down for the upgrade. It is anticipated to be back in service by 10:00 AM on 9/20. No user impact is expected as a result of this maintenance.