Also, for ironman and hardcore, death is permanent for whatever the reason. This includes disconnections, lag, server outtages, gameplay bugs, or absolutely any other reason. If your character dies, it is dead forever.
A GM will never resolve issues relating to challenge mode characters, for any reason. If you find a bug, then it can be reported and dealt with, but the negative consequences of the bug is not to be rectified. e.g: your HC character dying because of a bug, will not be restored!!!