We’ve had a site running in WPEngine, using the Cloudflare Advanced Network for about 1 year.
Suddenly just now between 5:05 and 5:16 Eastern, Cloudflare was returning the “DNS resolution error” page and throwing 409 Conflict Errors.
Cloudflare Analytics shows a complete drop-off in traffic during that time down to zero, so traffic does not seem to have been forwarded to the origin server during that time.
What could have caused this? How can I further investigate this? We haven’t made any changes at all to any Cloudflare or origin configuration in weeks, so I’m a bit puzzled by this.