I just talked with Jay Robertson, the VP for ASP hosting for Blackboard. He tells me that the network problem at the hosting center has been isolated to a problem with the firewall in the VA2 data center. Blackboard has escalated to the highest possible level with the firewall vendor.
BB will call me with any update and I will pass it on to you. Until then ..... don't make yourself crazy trying to get on today. Tomorrow is fine.
And note that the good news is -- this isn't a problem with Vista itself or our hardware. :^)