NEW YORK — A number of popular websites like Amazon and Netflix were down for some users on Friday morning in what appears to be a massive DDoS attack.
A DDoS attack — or denial of service — is an attempt to flood a website with so much traffic that it impairs normal service.
According to tech news forum Hacker News, the outage is a result of an attack on Dyn’s DNS server. Dyn manages website domains.
Among the sites that appear to be affected include Twitter, Etsy, Github, Vox, Spotify, Airbnb, Netflix and Reddit.
“Starting at [7:00 a.m. ET] on October 21… we began monitoring and mitigating a DDoS attack against our Dyn Managed DNS infrastructure,” the company said in a statement.
“This attack is mainly impacting U.S. East and is impacting Managed DNS customers in this region. Our engineers are continuing to work on mitigating this issue.”
By 9:20 a.m., Dyn said “the services have been restored to normal.”
But less than three hours later, Dyn said it was again monitoring an attack against its DNS server.
No one has claimed responsibility for the attack yet. A government official said the U.S. is “looking at all possible scenarios including possible cyber activity.”
While little information is available about the cause or who is behind the attack, companies turned to Twitter to tell customers to stay patient.
“Uh oh, we’re having some issues right now and investigating. We’ll keep you updated!” tweeted Spotify.
“A global event is affecting an upstream DNS provider. GitHub services may be intermittently available at this time,” tweeted GitHub.
DDoS Attack Against Dyn Managed DNS
Incident Report for Dyn, Inc.
Update: At this time, the advanced service monitoring issue has been resolved. Our engineers are still investigating and mitigating the attacks on our infrastructure.
Update: Dyn Managed DNS advanced service monitoring is currently experiencing issues. Customers may notice incorrect probe alerts on their advanced DNS services. Our engineers continue to monitor and investigate the issue.
Update: Our engineers continue to investigate and mitigate several attacks aimed against the Dyn Managed DNS infrastructure.
Update: This DDoS attack may also be impacting Dyn Managed DNS advanced services with possible delays in monitoring. Our Engineers are continuing to work on mitigating this issue.
Investigating: As of 15:52 UTC, we have begun monitoring and mitigating a DDoS attack against our Dyn Managed DNS infrastructure. Our Engineers are continuing to work on mitigating this issue.
Monitoring: Services have been restored to normal as of 13:20 UTC.
Update: This attack is mainly impacting US East and is impacting Managed DNS customers in this region. Our Engineers are continuing to work on mitigating this issue.
Investigating: Starting at 11:10 UTC on October 21st-Friday 2016 we began monitoring and mitigating a DDoS attack against our Dyn Managed DNS infrastructure. Some customers may experience increased DNS query latency and delayed zone propagation during this time. Updates will be posted as information becomes available.
Customers with questions or concerns are encouraged to reach out to our Technical Support Team.