![]() ![]() ![]() Security experts identified the problem as a Border Gateway Protocol (BGP) withdrawal of the IP address prefixes in which Facebook's Domain Name servers were hosted, making it impossible for users to resolve Facebook and related domain names, and reach services. Major DNS resolvers returning “SERVFAIL” status for ![]() Border Gateway Protocol (BGP) routing was restored for the affected prefixes at about 21:50, and DNS services began to be available again at 22:05 UTC, with application-layer services gradually restored to Facebook, Instagram, and WhatsApp over the following hour, with service generally restored for users by 22:50. The outage was caused by the loss of IP routes to the Facebook Domain Name System (DNS) servers, which were all self-hosted at the time. It lasted for 7 hours and 11 minutes.ĭuring the outage, many users flocked to Twitter, Discord, Signal, and Telegram, resulting in disruptions on these sites' servers. The outage also prevented anyone trying to use " Log in with Facebook" from accessing third-party sites. On October 4, 2021, at 15:39 UTC, the social network Facebook and its subsidiaries, Messenger, Instagram, WhatsApp, Mapillary, and Oculus, became globally unavailable for a period of six to seven hours. Traffic volume for Facebook services during Octoglobal outage. ![]()
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