I don't know. All I know is Deepbit is activating 3 different firewalls on three different DSL routers in 3 different locations. Backup servers of mtred and 50btc are working fine. After a while the firewall will allow the Deepbit IP address again and then the same thing happens. These farms have been mining Deepbit for a year with the same connections with zero problems. Something has changed.
What changed since the last DOS?