Yep... this from no-ip.com:
No-IP.com Network status update:
The Level(3) network, as well as many other internet providers are currently under a distributed denial of service (DDOS) attack based on a MS SQL exploit. The Level(3) network engineers are currently focusing all efforts on this issue. We will keep you posted as to the status of this issue.
Currently web redirects and access to the No-IP website is affected. Update clients will most likely receive a connection failed warning.
Hybrid Mode
