More than half of my sites have been down today due to the failure. All sites have been back up for the past two hours, but there are still many intermittent failures. Mydomaindotcom indicates on Twitter that the failure is due to a denial of service attack, but the timing is highly suspicious. Today is the first day that .co domain name registration becomes available to the general public. I’m trying to extricate my sites from this mess, but I can’t change any DNS settings until I can log into the control system.