Oh, DRM, how we love to loathe you. In the name of combating pirates, who don't seem the least bit deterred, you make playing games much more complicated than it really needs to be. Sometimes, you even prevent us from playing at all. Ubisoft is migrating a number of its online services to a new facility, and several games will be unplayable during the move.
The publisher details the affected games here, and the list is a short one. On the PC, only Tom Clancy's H.A.W.X. 2, Might & Magic: Heroes VI, and The Settlers 7: Paths to a Kingdom will be unplayable during the transition. Mac gamers won't have access to Assassin's Creed, Splinter Cell Conviction, and The Settlers. Ubisoft apologizes for the inconvenience, but it surprisingly doesn't provide a timeline for the lights to be turned back on. Users are urged to follow the publisher's Twitter for updates.
DRM is probably never going away, but publishers should ensure their schemes never prevent a legitimate player from accessing his games. If Ubisoft wants to move its DRM servers around, it should have backup servers at the ready to maintain service during the transition. At the very least, gamers should be given a timeline for when normal service will be restored. It's not like the affected games are all ages-old titles, either. Might & Magic: Heroes VI was released just a few months ago.