Some requests received by one of the London CDN servers failed due to a combination of local DNS resolution and pulsating network timeouts. The issue began at 1215 UTC and was resolved at 1332 UTC. During this period, 25% of requests from UK and Ireland returned a 404 or 500 error. The issue would have been solved sooner but an unrelated SSL certificate validation failure a few hours earlier blocked alerts from being received by our monitoring system.

Changes have already been deployed to prevent this issue from recurring. The SSL certificate issue has been resolved; a second level of independent monitoring has been configured; an additional health automation is being trialled that has the potential to resolve such issues automatically.

The issue has been resolved and is now being monitored.

Some requests to the London POP of Sirv CDN, are returning errors due to high load. This POP serves UK and Ireland. We are working on a resolution.