Final summary from DYN – (one of the major Managed DNS providers):

Service Affected: Managed DNS

Event cause:
On Friday October 21, 2016 at approximately 11:10 UTC, Dyn came under attack by a large Distributed Denial of Service (DDoS) attack against our Managed DNS infrastructure in the US-East region. Customers affected may have seen regional resolution failures in US-East and intermittent spikes in latency globally. Dyn’s engineers were able to successfully mitigate the attack at approximately 13:20 UTC, and shortly after, the attack subsided. See original status post here: https://www.dynstatus.com/incidents/nlr4yrr162t8.
At roughly 15:50 UTC a second DDoS attack began against the Managed DNS platform. This attack was distributed in a more global fashion. Affected customers may have seen intermittent resolution issues as well as increased global latency. At approximately 17:00 UTC, our engineers were again able to mitigate the attack and service was restored.

Update #3:  4:30 PM – The services and web sties are becoming available.  (PeopleAdmin (employment.denison.edu) and the Qualtrics Survey System (denison.qualtrics.com are currently available)

Update #2:  Major Internet service providers are reporting a 2nd round of Distributed Denial-of-Service (DDOS) attacks this afternoon.  ITS is monitoring the situation and will provide additional updates.

Some off-campus services and web sites may not be available.  (Examples:  PeopleAdmin (employment.denison.edu) and the Qualtrics Survey System (denison.qualtrics.com)

Update:

Our internet service provider, (OAR-NET) indicated earlier today that several major Internet service providers were being impacted by a large scale Denial-of-Service attack on the East Coast.  Those attacks have been resolved; however, the residual impacts to many services are still being seen.