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UPDATE: Today’s Cyber Attack is Resolved, This Was The Cause.

Twitter, Spotify and Reddit, and a huge swath of other websites were down or screwed up this morning. This was happening as hackers unleashed a large distributed denial of service (DDoS) attack on the servers of Dyn, a major DNS host. It’s probably safe to assume that the two situations are related.

DDoS Attack Against Dyn Managed DNS Chronological Incident Report
Resolved
This incident has been resolved.
Posted about 4 hours ago. Oct 21, 2016 – 22:17 UTC
Update
Our engineers continue to investigate and mitigate several attacks aimed against the Dyn Managed DNS infrastructure.
Posted about 4 hours ago. Oct 21, 2016 – 22:00 UTC
Update
Our engineers are continuing to investigate and mitigate several attacks aimed against the Dyn Managed DNS infrastructure.
Posted about 4 hours ago. Oct 21, 2016 – 21:30 UTC
Update
At this time, the advanced service monitoring issue has been resolved. Our engineers are still investigating and mitigating the attacks on our infrastructure.
Posted about 7 hours ago. Oct 21, 2016 – 18:52 UTC
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.Customers with questions or concerns are encouraged to reach out to our Technical Support Team.
Posted about 7 hours ago. Oct 21, 2016 – 18:23 UTC
Update
Our engineers continue to investigate and mitigate several attacks aimed against the Dyn Managed DNS infrastructure.
Posted about 8 hours ago. Oct 21, 2016 – 17:53 UTC
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.
Posted about 9 hours ago. Oct 21, 2016 – 16:48 UTC
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.
Posted about 10 hours ago. Oct 21, 2016 – 16:06 UTC
Monitoring
Services have been restored to normal as of 13:20 UTC.
Posted about 12 hours ago. Oct 21, 2016 – 13:36 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.
Posted about 13 hours ago. Oct 21, 2016 – 12:45 UTC
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.
Posted about 15 hours ago. Oct 21, 2016 – 11:10 UTC

In order to understand how one DDoS attack could take out so many websites, you have to understand how Domain Name Servers (DNS) work. Basically, they act as the Internet’s phone book and facilitate your request to go to a certain webpage and make sure you are taken to the right place. If the DNS provider that handles requests for Twitter is down, well, good luck getting to Twitter. Some websites are coming back for some users, but it doesn’t look like the problem is fully resolved. 

Dyn posted this update on its website: “Starting at 11:10 UTC on October 21th-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.”

fbi-investigation

Here’s a list of websites that readers have told us they are having trouble accessing:

  1. ActBlue
  2. Basecamp
  3. Big cartel
  4. Box
  5. Business Insider
  6. CNN
  7. Cleveland.com
  8. Etsy
  9. Github
  10. Grubhub
  11. Guardian.co.uk
  12. HBO Now
  13. Iheart.com (iHeartRadio)
  14. Imgur
  15. Intercom
  16. Intercom.com
  17. Okta
  18. PayPal
  19. People.com
  20. Pinterest
  21. Playstation Network
  22. Recode
  23. Reddit
  24. Seamless
  25. Spotify
  26. Squarespace Customer Sites
  27. Starbucks rewards/gift cards
  28. Storify.com
  29. The Verge
  30. Twillo
  31. Twitter
  32. Urbandictionary.com (lol)
  33. Weebly
  34. Wired.com
  35. Wix Customer Sites
  36. Yammer
  37. Yelp
  38. Zendesk.com
  39. Zoho CRM
  40. Credit Karma
  41. Eventbrite
  42. Netflix
  43. NHL.com
  44. Fox News
  45. Disqus
  46. Shopify
  47. Soundcloud
  48. Atom.io
  49. Ancersty.com
  50. ConstantContact
  51. Indeed.com
  52. New York Times
  53. Weather.com
  54. WSJ.com
  55. time.com
  56. xbox.com
  57. dailynews.com
  58. Wikia
  59. donorschoose.org
  60. Wufoo.com
  61. Genonebiology.com
  62. BBC
  63. Elder Scrolls Online
  64. Eve Online
  65. PagerDuty
  66. Kayak
  67. youneedabudget.com
  68. Speed Test
  69. Freshbooks
  70. Braintree
  71. Blue Host
  72. Qualtrics
  73. SBNation
  74. Salsify.com
  75. Zillow.com
  76. nimbleschedule.com
  77. Vox.com
  78. Livestream.com
  79. IndieGoGo
  80. Fortune
  81. CNBC.com
  82. FT.com
  83. Survey Monkey
  84. Paragon Game
  85. Runescape

Here’s an internet outage map from DownDetector as of 12:46 PM EST:

Here’s a gif that shows the internet outage at 9:00 AM EST versus 12:30 PM EST:

At the time of publication Dyn said that it was still dealing with the problem.

What websites are down for you? Send a tip to william.turton@gizmodo.com.

Update 9:05 AM EST: Judging by emails from readers, this problem seems to be getting worse.

Update 9:43 AM EST: Dyn says the issue has been resolved.

Update 12:19 PM EST: Dyn says the issue is resolved, but multiple readers are messaging me to say they’re still having trouble accessing websites.

Update 12:25pm EST: It’s happening again. (see above)

Source: Gizmodo

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