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.
不是連線數太多就是家長保護控制
但我猜應該都不是
應該是login server出現問題，因為老外也有人遇到同樣的狀況
http://us.battle.net/d3/en/forum/topic/12372637198
等暴雪維修吧