Starting at around 06:00 AM CST, July 23, 2012 Dotcom-Monitor began to detect a higher than usual number of DNS-related errors. The errors were sporadic and happening in bursts every couple of hours.
We are still looking for a root cause, but we believe issue started with a DDoS on Zerigo DNS services. We have a large number of our clients using Zerigo for their DNS hosting. Zerigo took their servers down due to the DDoS DNS this morning.