Facebook is back online after a six-hour outage due to DNS routing issues. The outage also removed Instagram, Whatsapp, Messenger and Oculus VR. For some, these services are back online now; after a DNS problem like this, however, it can take hours before everything works properly on all networks.
The interruption started just before noon ET on Monday. It was the biggest disruption for Facebook since an incident in 2019 took its site offline for more than 24 hours. Journalist Brian Krebs indicates a reliable source who told him that the incident had no malicious origin. Instead, they said it started with a routine BGP update that went wrong and deleted the DNS routing information that Facebook needs so other networks can find its sites.
The problem, however, meant that remote users could access the network to use it, and people on site did not have the network access needed to repair things. This reflects an anonymous report on the issue previously posted to Reddit (and quickly deleted), which cited pandemic protocols as a reason fewer people were on site than usual, slowing restoration efforts.
On Twitter, Facebook communications exec Andy Andy said, “We are aware that some people are having difficulty accessing our apps and products. We are working to get things back to normal as soon as possible and we apologize for the inconvenience. ”
Inside Facebook, the outage also broke internal systems, leaving employees unable to enter offices and easily communicate with each other. Some told The edge they used Outlook email accounts provided by the work, which allowed Facebook employees to email each other but could not send or receive emails from external addresses.