I had troubles earlier this week trying to log on.
Gamespy showed Ironworks as being offline Tuesday and Wednesday morning around 9 am Eastern time. I waited thinking that it could be just a reboot. After an hour and a half, Gamespy still showed the server offline both days.
Yesterday (Thursday) and today I had no problems (other than the usual Undermountain hordes sneak attacking my characters to death [img]tongue.gif[/img] )