See http://forum.mydomain.com/viewtopic.php?t=1537
The mydomain forwarding service is currently experiencing problems and will be taken down temporarily because of a DOS attack. Specifically, the domain, ALJAZEERA.NET, is currently pointed to the mydomain service and causing service problems.
The forwarding pool which usually has an average of 600 connection setups/second this time of the day shot to over 8,000 connection setups per second. As more and more people discovered the new Ip the connections continued to climb. Our A records have 30 minute TTL's and we have propagated a new zone with null values for the problem domain. We will lift our ACL's as soon as we can.