73 + 1
Error 73 may occur if you have more than the maximum number
of game accounts for a Battle.net account or when there is a
configuration issue with your Parental Controls.
不是连线数太多就是家长保护控制
但我猜应该都不是
应该是login server出现问题，因为老外也有人遇到同样的状况
http://us.battle.net/d3/en/forum/topic/12372637198
等暴雪维修吧