- Date
- June 2021
- Duration
- ~1-2 hours
- Root cause
- A latent software bug in Fastly's CDN (introduced in a May 12 update) was triggered by a valid customer configuration change on June 8, 2021, causing Fastly points-of-presence to fail globally.
- Services affected
- reddit.com web and app (via Fastly CDN); alongside Amazon, Twitch, Spotify, GitHub, The Guardian, NYT and dozens more
Impact
Reddit and large swaths of the internet returned 503/error pages for roughly an hour beginning around 09:50 UTC. Service was restored the same morning once Fastly deployed a fix.