Widespread Website Outages - Fastly CDN
Commencing just before 1000hrs UTC on June 8, 2021, widespread reports of high-profile websites being unavailable began to surface with visitors to these sites receiving ominous looking error messages (Figure 1). Figure 1 - Example outage message 'gov.uk' Initially, many of these error messages returned a HTTP error '503', advising the user that the service is unavailable, and these originated from a 'Varnish cache server' HTTP accelerator that was attempting to serve the intended content.