Facebook, WhatsApp, Messenger, and Instagram appear to be back online after an outage that lasted several hours on Monday.
Earlier on Monday, when one tried to access Facebook, it returned a message: “This site can’t be reached,” adding that the website’s DNS address couldn’t be found. Instagram merely displayed the message: “5xx Server Error.”
But at around 5:45 p.m. ET, Instagram and Facebook appeared to be back online for many, according to Downdetector.com.
“We’re aware that some people are having trouble accessing our apps and products,” Facebook wrote on Twitter at around 12:30 p.m. New York time. “We’re working to get things back to normal as quickly as possible, and we apologize for any inconvenience.”
Hours later, at around 3 p.m., the company’s outgoing chief technology officer, Mike Schroepfer, wrote that the firm is still working to fix the issue.
“*Sincere* apologies to everyone impacted by outages of Facebook-powered services right now,” he wrote on Twitter. “We are experiencing networking issues and teams are working as fast as possible to debug and restore as fast as possible.”
Twitter, YouTube, iMessage, Signal, and other popular services not operated by Facebook were still working as of noon on Oct. 4. However, some Twitter users reported problems—namely with their replies.
Some speculated that Facebook suffered major DNS—or Domain Name System—as well as Border Gateway Protocol (BGP) failures. DNS essentially translates domain names to IP addresses required for locating and identifying computer services and devices.
“By not having BGP announcements for your DNS name servers, DNS falls apart = nobody can find you on the internet. Same with WhatsApp btw. Facebook have basically deplatformed themselves from their own platform,” wrote Kevin Beaumont, former head of security operations at Microsoft, in a Twitter post.
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