Facebook, Instagram and WhatsApp are once again accessible, more than six hours after users first reported a major outage that took the services offline on Monday. Some of the services are not yet fully functioning — for example, some users are still reporting problems posting new content to Instagram.
Facebook has not yet explained what went wrong.
All three platforms stopped working shortly before noon ET, when the websites and apps for Facebook’s services were responding with server errors. Reports on DownDetector.com showed the outages appeared to be widespread, but it was unclear how many users were unable to access the apps.
ThousandEyes, a network monitoring service owned by Cisco, said in an email that the outage was the result of DNS failure. DNS, short for Domain Name System, is like a phone book for websites.
The outage marked the longest stretch of downtime for Facebook since 2008, when a bug knocked the site offline for about a day, affecting about 80 million users. The platform currently boasts 3 billion users.
Mike Schroepfer, Facebook’s chief technology officer, apologized in a statement posted to Twitter.
“Sincere apologies to everyone impacted by outages of Facebook powered services right now,” Schroepfer wrote. “We are experiencing networking issues and teams are working as fast as possible to debug and restore as fast as possible.”
In 2019, a similar outage lasted about an hour. Facebook blamed a server configuration change for that outage.
The outage comes one day after the whistleblower who leaked private internal research to both The Wall Street Journal and U.S. Congress revealed herself ahead of an interview with “60 Minutes.” The documents, first reported in a series of Journal stories, revealed that the company’s executives understood the negative impacts of Instagram among younger users and that Facebook’s algorithm enabled the spread of misinformation, among other things.
Facebook shares closed down almost 5% on the day.
This news is developing. Please check back for updates.
This article was originally published on CNBC