Zerigo dns down (DDOS)
per http://zerigostatus.com/
All the name servers are down:
Posted at 06/22/2013 03:37 UTC
a.ns.zerigo.net - Down b.ns.zerigo.net - Down c.ns.zerigo.net - Down d.ns.zerigo.net - Down e.ns.zerigo.net - Down f.ns.zerigo.net - Down