Access to our web site unexpectedly went down for around 1 hour.

Word from hosting company (Pair Networks, Pair.com) is,

"Shortly after 5am Eastern, a specific set of our Web servers came under sustained attack. We are currently working to mitigate the problem and restore normal service for all customers. We will post further information as it becomes available."

Seem like they have sorted it out and we are back up now.