File systems on both the HoN databases were destroyed during a "chassis swap" , which is "almost statistically impossible". It's "coming back up slowly."
Fans on the official Heroes of Newerth forums have been venting their anger at developer S2 Games, regarding this as just one of many troubles HoN has suffered.
"During our scheduled maintenance period this morning we had a catastrophic hardware failure across a number of systems including some of our backup systems. We have the capacity and ability to recover from this failure," the studio yesterday.
This occurred when they "attempted to upgrade the processor on our database boxes. Both of our servers were simultaneously taken offline while the new hardware was being put in place. During this period of time, the file systems on BOTH boxes were destroyed."
"If this boggles your mind to the point that you can't believe it could happen, you would be in the same exact boat we are! It seems almost statistically impossible, however, it is in fact what happened," they continued.
"This leaves us with no hardware to operate our DBs from until we can get new servers online. The reason for such a catastrophic situation is that this hardware is not the type that is simply sitting around, even in the largest hosting facilities in the world (in which we host at)."
"We are scrambling to bring our systems back online temporarily so you can play the game through other short term methods while we get new hardware online." It would appear they've got everything back under control now though with HoN returning.
"We are turning everything back on now. The systems, logins, and such will be coming back up slowly." Heroes of Newerth released in March 2010 and is inspired by Warcraft III mod Dawn of the Ancients as it pits the Legion and Hellbourne against each other.