Enlarge / Today’s global Facebook and Facebook-owned-services outage appears to be the result of a flubbed BGP configuration change pushed by a Facebook engineer this morning. (credit: Sean Gladwell via Getty Images / Jim Salter)
So, @facebook’s DNS is broken this morning…
TL;DR: Google anycast DNS returns SERVFAIL for Facebook queries; querying https://t.co/0BDgaIHmlr directly times out. pic.twitter.com/3GHJ3mW0P0
— Jim Salter (@jrssnet) October 4, 2021
DNS—short for Domain Name System—is the service that translates human-readable hostnames (like arstechnica.com) to raw, numeric IP addresses (like 18.221.249.245). Without working DNS, your computer doesn’t know how to get to the servers that host the website you’re looking for.
The problem goes deeper than Facebook’s obvious DNS failures, though. Facebook-owned Instagram was also down, and its DNS services—which are hosted on Amazon rather than being internal to Facebook’s own network—were functional. Instagram and WhatsApp were reachable but showed HTTP 503 failures (no server is available for the request) instead, an indication that while DNS worked and the services’ load balancers were reachable, the application servers that should be feeding the load balancers were not.
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